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Elasticsearch Reference [2.1] » Release Notes » 2.0.0-beta1 Release Notes

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2.0.0-beta1 Release Notesedit

Breaking changesedit

Aggregations

• Removed unused factor parameter in DateHistogramBuilder #12850 (issue: #6490)
• Aggregation: Removed Old Script Java API from metrics aggregations #12236
• Change the default min_doc_count to 0 on histograms. #10904
• Speed up include/exclude in terms aggregations with regexps, using Lucene regular expressions #10418 (issues: #7526, #9848)
• Clean up time zone options for date_histogram #9637 (issue: #9062)
• Add offset to date_histogram, replacing pre_offsest and post_offset #9597 (issue: #9062)
• Facets: Removal from master. #7337
• Changed the respnose structure of the percentiles aggregation #6079 (issue: #5870)

Aliases

• Throw exception if index is null or missing when creating an alias #8240 (issues: #7863, #7976)

Allocation

• Default delayed allocation timeout to 1m from 0 #12166
• Remove old 0.90 shard allocator #10889
• Enable DiskThresholdDecider by default, change default limits to 85/90% #6204 (issues: #6200, #6201)

Analysis

• Add multi-valued text support to the analyzer API #10847 (issue: #3023)
• Term positions in analyze API should start at 1, not 0 #10771
• Improvements to StemmerTokenFilter #6452

Bulk

• Remove Bulk UDP #7595

CAT API

• Filtered out non data-nodes in relevant cat api #9287
• Default _cat APIs to verbose #8927 (issue: #8922)

CRUD

• Remove core delete-by-query implementation #10859 (issue: #10067)
• Remove async replication #10171 (issue: #10114)
• Remove async replication from the docs and REST spec #10162 (issue: #10114)
• Delete api: remove broadcast delete if routing is missing when required #10136 (issue: #9123)
• Version types EXTERNAL & EXTERNAL_GTE test for version equality in read operation & disallow them in the Update API #5929 (issues: #5661, #5663)

Cache

• Make ordinals start at 0. #5946 (issue: #5871)

Circuit Breakers

• Add HierarchyCircuitBreakerService #6739 (issue: #6129)

Cluster

• Remove _shutdown API #10831
• Cluster State API: Remove index template filtering #6020 (issue: #4954)

Core

• Remove MergeScheduler pluggability #11585
• Don’t allow indices containing too-old segments to be opened #11072 (issues: #10215, #11095)
• Remove Restart API and remove Node#stop() #9921 (issue: #9841)
• Remove component settings from AbstractComponent #9919
• Refactor settings filtering, adding regex support #9748 (issue: #6295)
• Cut over to Path API for file deletion #8366
• Switch to murmurhash3 to route documents to shards. #7954
• Resiliency: Throw exception if the JVM will corrupt data. #7580
• Remove deprecated gateways #5520 (issue: #5422)

Discovery

• Default to unicast discovery, with default host list of 127.0.0.1, [::1] #12999 (issue: #12993)

Engine

• Remove full flush / FlushType.NEW_WRITER #9559

Exceptions

• Generify Index and Shard exceptions #12023
• Streamline use of IndexClosedException introduced with #6475 #6990 (issues: #6475, #6988)
• Thread pool rejection status code should be 429 #6629 (issue: #6627)

Fielddata

• Fielddata: Remove soft/resident caches. #7443

Highlighting

• Wildcard field names in highlighting should only return fields that can be highlighted #11364 (issue: #9881)
• Remove XPostingsHighlighter in favour of Lucene’s PostingsHighlighter #11077 (issue: #10625)
• require_field_match now defaults to true #11067 (issue: #10627)

Index APIs

• Change behaviour of indices segments api to allow no indices #9219 (issue: #5856)
• REST API: Removed support for aliases as part of index settings #5545

Index Templates

• Remove file based index templates #11052 (issue: #10870)
• GET templates doesn’t honor the flat_settings parameter. #6672 (issue: #6671)

Internal

• Flatten SearchService and clean up build-in registration #12807 (issue: #12783)
• Consolidate shard level abstractions #11847
• Bake in TieredMergePolicy #11588
• Remove Translog interface #10988
• Remove InternalNode class and use Node directly #9844
• Remove OperationRouting abstraction #9085
• Drop support for state written pre 0.90 #8850
• Remove some more bwc code #8778
• Remove optional original indices #8777 (issue: #7406)
• Remove runtime version checks #8768
• Remove NoneGateway, NoneGatewayAllocator, & NoneGatewayModule #8537
• Simplify reading / writing from and to BlobContainer #7551
• Refactor guice startup #7289
• Fixed filters execution order and fix potential concurrency issue in filter chains #7023 (issues: #7019, #7021)
• Make transport action name available in TransportAction base class #6860
• Cleanup Rest Response #5612
• Remove Releasable in favor of Closeable [ISSUE] #5423

Java API

• Java api: remove execution from TermsQueryBuilder as it has no effect #12884
• Enhancement/terms lookup fixes #12870
• Centralize admin implementations and action execution #10955
• Automatically thread client based action listeners #10940
• Remove redundant BytesQueryBuilder in favour of using WrapperQueryBuilder internally #10919
• Aggregations: Clean up response API for Aggregations #9221
• QueryBuilders cleanup (add and deprecate) #8667 (issue: #8721)
• Remove operationThreaded setter from ExplainRequestBuilder #7186
• Remove unnecessary intermediate interfaces #6517 (issue: #4355)
• Unify IndicesOptions constants #6068 (issue: #6059)
• Remove operation threading from broadcast actions #6044
• Remove search operation threading option #6042
• Make Create/Update/Delete classes less mutable #5939 (issue: #5917)

Logging

• Truncate log messages at 10,000 characters by default #11050

Mapping

• Disallow type names to start with dots for new indices except for .percolator #12561 (issue: #12560)
• Remove ability to configure _index #12356 (issues: #12027, #12329)
• Enforce field names do not contain dot #12068
• Restrict fields with the same name in different types to have the same core settings #11812 (issue: #8871)
• Lockdown _timestamp field #11794 (issues: #6730, #8143)
• Remove the compress/compress_threshold options of the BinaryFieldMapper #11280
• Remove ability to set the value of meta fields inside _source #11074 (issue: #11051)
• Remove file based default mappings #10870 (issue: #10620)
• Validate dynamic mappings updates on the master node. #10634 (issues: #8650, #8688)
• Remove delete mapping API #10231 (issue: #8877)
• Lock down _ttl field #9914 (issue: #8143)
• Lock down _size field #9913 (issue: #8143)
• Lock down _field_names field #9912 (issue: #8143)
• Remove _boost field #9897 (issue: #8875)
• Lock down _routing field #9895 (issue: #8143)
• Lock down _index field #9870 (issue: #8143)
• Lock down _type field #9869 (issue: #8143)
• Lock down _id field #9842 (issue: #8143)
• Lock down _uid field #9836 (issue: #8143)
• Remove the ability to have custom per-field postings and doc values formats. #9741 (issue: #8746)
• Remove support for new indexes using path setting in object/nested fields or index_name in any field #9570 (issue: #6677)
• Remove type prefix support from field names in queries #9492 (issue: #8872)
• Remove index_analyzer setting to simplify analyzer logic #9451 (issue: #9371)
• Remove type level default analyzers #9430 (issues: #8874, #9365)
• Remove _analyzer field #9381 (issue: #9279)
• Remove fieldSearchAnalyzer and fieldSearchQuoteAnalyzer from MapperService. #9262
• Remove allow_type_wrapper setting #9185
• Add doc values support to boolean fields. #7961 (issues: #4678, #7851)
• Remove unsupported postings_format / doc_values_format #7604 (issues: #7238, #7566)
• Mappings: Update mapping on master in async manner #6648
• The binary field shouldn’t be stored by default, because it is already available in the _source #4957

More Like This

• Remove percent_terms_to_match #11030
• Remove the MLT API #11003 (issue: #10736)

NOT CLASSIFIED

• Rivers removal. #11568

Network

• Move multicast discovery to a plugin #13027 (issues: #12993, #12999, #13019)
• Ban java serialization #11910
• Default to binding to loopback address #11483 (issues: #11300, #7077)
• Remove unsafe options #10360
• Remove references to the thrift and memcached transport plugins #10169 (issue: #10166)

Packaging

• Remove Environment.homeFile() #12351
• Startup: Remove getopt parsing in shell script, use java CLITool #12165

Parent/Child

• Remove the top_children query #11028 (issue: #11022)
• Refactoring parent/child to improve memory consumption and query execution. #6511 (issues: #10135, #10485, #6107, #8134)

Plugins

• Simplify Plugin API for constructing modules #12952
• Use name from plugin descriptor file to determine plugin name #12775 (issue: #12715)
• make java.version mandatory for jvm plugins #12424
• Adapt pluginmanager to the new world #12408
• Refactor pluginservice #12367 (issue: #11917)
• CLITool: Port PluginManager to use CLITool #12290
• One single (global) way to register custom query parsers #11481
• Don’t overwrite plugin configuration when removing/upgrading plugins #7890 (issue: #5064)

Query DSL

• Don’t allow fuzziness specified as a % and require edits [0,2] instead #12229 (issue: #10638)
• Remove filter parsers. #10985
• Deprecate the limit filter. #10532
• Remove fuzzy_like_this query #10391
• Function Score: Refactor RandomScoreFunction to be consistent, and return values in range [0.0, 1.0] #7446 (issue: #6907)
• Remove numeric_range filter #7242 (issues: #4034, #7108)
• Remove custom_score and custom_boost_factor queries #5076

REST

• Cluster state: return routing_nodes only when requested through specific flag #10486 (issue: #10412)
• Remove jsonp support and associated tests #9242 (issue: #9108)
• Remove status code from main action / #8865
• Add all meta fields to the top level json document in search response #8131
• Security: Disable JSONP by default #6795
• Removed Index Status API #6062 (issue: #4854)

Recovery

• Decouple recoveries from engine flush #10624
• RecoveryState clean up #9811 (issue: #6644)

Scripting

• Remove deprecated script APIs #11619
• Add script type and script name to error messages #11449 (issue: #6653)
• Added a new script construct #10649
• Remove deprecated methods from ScriptService #10476
• Remove support for script.disable_dynamic setting #10286 (issue: #10116)
• Cleanup ScriptService & friends in preparation for #6418 #9992 (issue: #6418)
• Removed deprecated script parameter names #9815
• Disable dynamic Groovy scripting by marking Groovy as not sandboxed [ISSUE] #9655
• Created a parameter parser to standardise script options #7977
• Script with _score: remove dependency of DocLookup and scorer #7819 (issues: #7043, #7487)
• Remove MVEL as a built-in scripting language #6610
• Switch to Groovy as the default scripting language #6571 (issue: #6233)
• Disable dynamic scripting by default #5943 (issue: #5853)

Search

• Cut over to the Lucene filter cache #10897
• Remove terms filter lookup cache. #9056
• Fix script fields to be returned as a multivalued field when they produce a list #8592 (issue: #3015)
• Remove partial fields #8133
• Only return aggregations on the first page with scroll and forbidden with scan #7497 (issue: #1642)

Settings

• Do not permit multiple settings files #13043 (issue: #13042)
• change CORS allow origin default to allow no origins #11890 (issue: #11169)
• Require units for time and byte-sized settings, take 2 #11437 (issues: #10888, #7616, #7633)
• Remove mapping.date.round_ceil setting for date math parsing #8889 (issues: #8556, #8598)
• Add a index.query.parse.allow_unmapped_fields setting that fails if queries refer to unmapped fields. #6928 (issue: #6664)
• Change default filter cache to 10% and circuit breaker to 60% #5990

Shadow Replicas

• Remove the node.enable_custom_paths setting #12837 (issue: #12776)
• Add path.shared_data, change index.data_path to be relative #11065

Snapshot/Restore

• Url repository should respect repo.path for file urls #11687
• Fix FSRepository location configuration #11157 (issues: #10828, #11068)
• Remove obsolete expand_wildcards_open and expand_wildcards_close options #10744 (issues: #10743, #6097)
• Automatic verification of all files that are being snapshotted with Snapshot/Restore #7159 (issue: #5593)
• Add Partial snapshot state #5793 (issue: #5792)

Stats

• Remove network stats & info #12054
• Update fs stats #12053
• Update OS stats #12049
• Update process stats #12043
• Remove sigar completely #12010
• Replacing sigar #11995 (issue: #11034)
• Removed id_cache from stats and cat apis. #11183 (issue: #5269)
• Cleanup JVM info and stats #10553
• Add human readable start_time and refresh_interval #5544 (issue: #5280)
• Migrating NodesInfo API to use plugins instead of singular plugin #5072

Store

• Simplify IndexStore and friends #10773
• Remove memory/ ram store #8536
• Remove the in memory buffer Lucene store/directory [ISSUE] #4994

Term Vectors

• More consistent naming for term vector[s] #8484

Deprecationsedit

Fielddata

• Remove non-default fielddata formats. #11669

Geo

• Deprecate validate_* and normalize_* #10248 (issue: #10170)

NOT CLASSIFIED

• Deprecate rivers #10503
• Warning in documentation for deprecation of rivers #10423 (issue: #10345)

Settings

• Remove index.fail_on_merge_failure #10088 (issue: #10084)
• Remove dangling indices settings, always import it #10016

New featuresedit

Aggregations

• Add HDRHistogram as an option in percentiles and percentile_ranks aggregations #12362 (issue: #8324)
• Aggregations: Adds other bucket to filters aggregation #11948 (issue: #11289)
• Aggregations: Pipeline Aggregation to filter buckets based on a script #11941
• Adds cumulative sum aggregation #11825
• Allow users to perform simple arithmetic operations on histogram aggregations #11601 (issue: #11029)
• Aggregations: add serial differencing pipeline aggregation #11196 (issue: #10190)
• Add Holt-Winters to moving_avg aggregation #11043
• Make it possible to configure missing values. #11042 (issue: #5324)
• Adding Sum Bucket Aggregation #11013 (issue: #11007)
• Adding Average Bucket Aggregation #11010 (issue: #11006)
• min_bucket aggregation #10900 (issue: #9999)
• Pipeline aggregations: Ability to perform computations on aggregations #10568 (issues: #10000, #10002, #9293, #9876)
• Sampler aggregation #10221 (issue: #8108)
• PercentageScore heuristic for significant_terms #9747 (issue: #9720)
• Return the sum of the doc counts of other buckets in terms aggregations. #8213
• Significant terms: add scriptable significance heuristic #7850
• Scriptable Metrics Aggregation #7075 (issue: #5923)
• Added pre and post offset to histogram aggregation #6980 (issue: #6605)
• Added Filters aggregation #6974 (issues: #6118, #6119)
• Add children aggregation #6936
• Significant Terms: Add google normalized distance and chi square #6858
• Infrastructure for changing easily the significance terms heuristic #6561
• Added percentile rank aggregation #6432 (issue: #6386)
• Deferred aggregations prevent combinatorial explosion #6128
• Support bounding box aggregation on geo_shape/geo_point data types. [ISSUE] #5634
• Add reverse nested aggregation [ISSUE] #5485
• Cardinality aggregation [ISSUE] #5426
• Percentiles aggregation [ISSUE] #5323
• Significant_terms aggregation #5146
• Add preserve original token option to ASCIIFolding #5115 (issue: #4931)
• Add script support to value_count aggregations. #5007 (issue: #5001)

Allocation

• Cancel replica recovery on another sync option copy found #12421
• Optional Delayed Allocation on Node leave #11712

Analysis

• Add keep_types for filtering by token type #7120
• Add uppercase token filter #5539

CAT API

• Add _cat/nodeattrs API #12534 (issue: #8000)
• Add wildcard support for header names #11367 (issue: #10811)
• Show open and closed indices in _cat/indices #7936 (issue: #7907)
• Add /_cat/fielddata to display fielddata usage #6086 (issue: #4593)
• Add _cat/plugins endpoint [ISSUE] #4824
• Add _cat/segments [ISSUE] #4711

CRUD

• Update API: Add support for scripted upserts. #7144
• Update API - allow scripted upserts [ISSUE] #7143
• Update API: Detect noop updates when using doc #6862 (issue: #6822)
• Introducing VersionType.FORCE & VersionType.EXTERNAL_GTE #4993 (issues: #2946, #4213)

Cache

• Query Cache: Support shard level query response caching #7161

Circuit Breakers

• Allow setting individual breakers to "noop" breakers #8135
• Add NoopCircuitBreaker used in NoneCircuitBreakerService #8063

Core

• Expose auto-IO-throttle from Lucene’s ConcurrentMergeScheduler #9243 (issue: #9133)
• Switch auto-generated IDs to Flake IDs from random UUIDs #7531 (issues: #5941, #6004)

Dates

• Added epoch date formats to configure parsing of unix dates #11453 (issues: #10971, #5328)

Index APIs

• Add date math support in index names #12209 (issue: #12059)
• Added GET Index API #7234 (issue: #4069)
• Force single-segment merges [ISSUE] #5243
• Create index to support aliases [ISSUE] #4920
• Add Recovery API. #4802 (issue: #4637)

Index Templates

• Made template filtering generic and extensible #7454 (issue: #7459)
• Added support for aliases to index templates #5180 (issues: #1825, #2739)

Indexed Scripts/Templates

• Allow search templates stored in an index to be retrieved and used at search time #5921 (issues: #5484, #5637)

Internal

• Added an option to add arbitrary headers to the client requests #7127

Java API

• Improved Suggest Client API #7507 (issue: #7435)

Logging

• Infra for deprecation logging #11285 (issue: #11033)
• Infra for deprecation logging #11033
• Add ability to specify a SizeBasedTriggeringPolicy for log configuration #10373 (issue: #10371)

Mapping

• Bring back numeric_resolution #10420 (issue: #10072)
• Add new default option for timestamp field #7036 (issue: #4718)
• Add transform to document before index. #6599 (issue: #6566)
• Add doc values for binary field #5669

More Like This

• Add an unlike parameter #8674
• Support for artificial documents in MLT query #7725

Percolator

• Enable percolation of nested documents #5082

Plugin Delete By Query

• Add delete-by-query plugin #11516

Plugins

• add list parse methods to XContentParser #10455
• Migration advisory plugin [ISSUE] #10214

Query DSL

• Query DSL: Add filter clauses to bool queries. #11142
• Add span within/containing queries. #10913
• Add time_zone setting for query_string #8164 (issue: #7880)
• Add format support for date range filter and queries #7821 (issue: #7189)
• Add min_score parameter to function score query to only match docs above this threshold #7814 (issue: #6952)
• Function score multi values #5940 (issue: #3960)
• Add the field_value_factor function to the function_score query #5519
• Added cross_fields type to multi_match query #5005 (issue: #2959)
• Allow for executing queries based on pre-defined templates [ISSUE] #4879

REST

• API: Add response filtering with filter_path parameter #10980 (issue: #7401)
• Render REST errors in a structural way #10643 (issue: #3303)
• Add CBOR data format support #5509 (issue: #4860)

Recovery

• Add basic recovery prioritization to GatewayAllocator #11975 (issue: #11787)
• Move index sealing terminology to synced flush #11336 (issues: #10032, #11179, #11251)
• Seal indices for faster recovery #11179 (issue: #10032)

Scripting

• Add Multi-Valued Field Methods to Expressions #11105
• Add support for fine-grained settings #10116 (issues: #10274, #6418)
• Add script engine for Lucene expressions #6819 (issue: #6818)
• Add Groovy as a scripting language, add groovy sandboxing #6233
• Add Groovy as a scripting language, switching default from Mvel → Groovy #6106

Search

• Validate API: provide more verbose explanation #10147 (issues: #1412, #88247)
• Add inner hits to nested and parent/child queries #8153 (issues: #3022, #3152)
• Sorting: Allow _geo_distance to handle many to many geo point distance #7097 (issue: #3926)
• Add search-exists API to check if any matching documents exist for a given query #7026 (issue: #6995)
• Add an option to early terminate document collection when searching/counting #6885 (issue: #6876)
• Sequential rescores [ISSUE] #4748

Search Templates

• Search Templates: Adds API endpoint to render search templates as a response #11570 (issue: #6821)

Settings

• Add ability to prompt for selected settings on startup #10918 (issue: #10838)
• bootstrap.mlockall for Windows (VirtualLock) #10887 (issues: #8480, #9186, #9923)
• Add checksum option for index.shard.check_on_startup #9183

Shadow Replicas

• Allow shards on shared filesystems to be recovered on any node #10960 (issue: #10932)
• Shadow replicas on shared filesystems #9727 (issue: #8976)

Stats

• Add script compilation stats #12733 (issue: #12673)
• Add OS name to _nodes and _cluster/nodes #11807
• Add an API to locate unrecovered shards and their state #11545 (issue: #10952)
• Cluster Health: Add wait time for pending task and recovery percentage #11393 (issue: #10805)
• Add field stats api #10523

Store

• Add index.data_path setting #9033 (issues: #8819, #8976)
• Add best_compression option for indices #8863

Suggesters

• Phrase Suggester: Add option to filter out phrase suggestions #6773 (issue: #3482)
• ContextSuggester #4044 (issue: #3959)

Term Vectors

• Return term vectors as part of the search response #10729 (issue: #10823)
• Support terms filtering #9561

Top Hits

• Add top_hits aggregation #6124

Upgrade API

• Add API to upgrade old Lucene indices to the latest version #7922 (issue: #7884)

Enhancementsedit

Aggregations

• Make ValueParser.DateMath aware of timezone setting #12886 (issue: #12278)
• Fix setting timezone on default DateTime formatter #12581 (issue: #12531)
• Aggregations: Add better validation of moving_avg model settings #12280
• Aggregations: Adds a new GapPolicy - NONE #11951
• Aggregations: Makes ValueFormat and ValueFormatter never null #11943 (issue: #10594)
• Add cost minimizer to tune moving_avg parameters #11881
• Aggregations: moving_avg model parser should accept any numeric #11778 (issue: #11487)
• Renaming reducers to Pipeline Aggregators #11275
• Improve include/exclude clause list speed and scalability #11188 (issue: #11176)
• Remove pointless term frequency lookups. #11094 (issue: #11093)
• Rename Moving Average models to their "common" names #10964
• Derivative Aggregation x-axis units normalisation #10898
• Added context for significant_terms scoring #10633 (issue: #10613)
• Removed aggregations from ReduceContext #10509
• Format bucket key_as_string in date_histogram according to time_zone #9744 (issue: #9710)
• Refactor aggregations to use lucene5-style collectors. #9544 (issues: #6477, #9098)
• Add offset option to histogram aggregation #9505 (issue: #9417)
• Unify histogram implementations #9446
• Internal simplifications. #9097
• Numeric metric aggregations are now formattable #9032 (issue: #6812)
• Adds methods to get to/from as Strings for Range Aggs #9026 (issue: #9003)
• Made the nested, reverse_nested and children aggs ignore unmapped nested fields or unmapped child / parent types. #8808 (issue: #8760)
• Do not sort histogram buckets on shards. #8797
• Make size property parsing inconsistent #8645 (issue: #6061)
• Do not take deleted documents into account in aggregations filters. #8540
• Added getProperty method to Aggregations #8421
• Meta data support with each aggregation request/response #8279 (issue: #6465)
• Buckets can now be serialized outside of an Aggregation #8113 (issue: #8110)
• Support for arrays of numeric values in include/exclude clauses #7727 (issue: #7714)
• Add ability to sort on multiple criteria #7662 (issues: #6917, #7588)
• Encapsulate AggregationBuilder name and make getter public #7425
• Merge LongTermsAggregator and DoubleTermsAggregator. #7279
• Remove the logic to optionally sort/dedup values on the fly. #7276
• Make the list of buckets for terms and histogram returned as a java.util.List. #7275
• Stops direct subclassing of InternalNumericMetricsAggregation #7058
• Better JSON output scoping #6985 (issue: #7004)
• Better heuristic for setting default shard_size in terms aggregation #6960 (issue: #6857)
• Added an option to show the upper bound of the error for the terms aggregation #6778 (issue: #6696)
• Extend allowed characters in aggregation name [ISSUE] #6702
• Moved BucketsAggregator#docCounts field to IntArray #6529
• GlobalOrdinalsStringTermsAggregator is inefficient for high-cardinality fields [ISSUE] #6518
• Remove ordinals execution hint. #6499
• Delegation of nextReader calls #6477
• Add shard_min_doc_count parameter to terms aggregation #6143 (issues: #5998, #6041)
• Add shard_min_doc_count parameter for significant terms similar to shard_size #6041
• Add include/exclude support to global ordinals based terms and significant terms aggregations #6000
• Lower the initial sizing of sub aggregations. #5994
• Improve the way sub-aggregations are collected. #5975
• Add global ordinal based implementations for significant terms aggregation #5970
• Use collectExistingBucket() if a bucket already exists #5955
• Significant_terms agg: added option for a backgroundFilter #5944
• Improve terms aggregation to perform the segment ordinal to global ordinal lookup post segment collection #5895
• Remove abstraction in the percentiles aggregation. #5859
• Instantiate facets/aggregations during the QUERY phase. #5821
• Aggregation cleanup #5699
• Aggregations cleanup #5614
• Refactor common code for unmapped aggregators into NonCollectingAggregator. #5528
• Significant_terms agg only creates term frequency cache when necessary #5459 (issue: #5450)
• Added extended_bounds support for date_/histogram aggs #5444 (issue: #5224)
• Make aggregations CacheRecycler-free. #5419 (issue: #4929)
• Added support for sorting buckets based on sub aggregation down the current hierarchy #5340 (issue: #5253)
• Terms aggs: only use ordinals on low-cardinality fields by default. #5304 (issue: #5303)
• Rest API needs to be consistent across all multi-bucket aggs [ISSUE] #4926
• cleanup of aggregations api #4894 (issue: #4922)

Aliases

• Don’t require fields in alias filters to exist in the mapping #12150
• Parse aliases at search time and never cache parsed alias filters #11930 (issue: #10485)

Allocation

• Add expectedShardSize to ShardRouting and use it in path.data allocation #12947 (issue: #11271)
• Make RoutingNodes read-only by default #12690
• Avoid extra reroutes of delayed shards in RoutingService #12678 (issues: #12456, #12515, #12532)
• Reroute shards when a node goes under disk watermarks #12452 (issue: #12422)
• No need to find replica copy when index is created #12435
• Adapt IndicesClusterStateService to use allocation ids #12397 (issues: #12242, #12387)
• Simplify handling of ignored unassigned shards #12339
• Initial Refactor Gateway Allocator #12335
• Use recently added allocation ids for shard started/failed #12299 (issue: #12242)
• Unique allocation id #12242
• Allow shards to be allocated if leftover shard from different index exists #12237 (issue: #10677)
• Simplify assignToNode to only do initializing #12235
• Simplify ShardRouting and centralize move to unassigned #11634
• When using recover_on_any_node on shared filesystem, respect Deciders #11168
• Async fetch of shard started and store during allocation #11101 (issue: #9502)
• Verify shards index UUID when fetching started shards #10200
• Early terminate if the cluster can’t be rebalanced #9162
• Speed-up disk-threshold decider #8803 (issue: #6372)
• DiskThresholdDecider#remain(…) should take shards relocating away into account #8659 (issue: #8538)
• Take percentage watermarks into account for reroute listener #8382 (issues: #8367, #8368)
• Reroute shards automatically when high disk watermark is exceeded #8270 (issue: #8146)
• Add rebalance enabled allocation decider #8190 (issue: #7288)
• Add option to take currently relocating shards' sizes into account #7785 (issues: #6168, #7753)
• Allow primaries that have never been allocated to be allocated if under the low watermark #6209 (issue: #6196)
• Add explanations for all AllocationDeciders #4934 (issues: #2483, #4380)
• Make shard balancing deterministic if weights are identical #4866

Analysis

• Document and test custom analyzer position_offset_gap #10934 (issue: #1812)
• Expose Latvian analyzer #7542
• Improve Hunspell error messages #6850
• Share numeric date analyzer instances between mappings #6843
• Add missing pre built analysis components #6770
• PatternAnalyzer should use PatternTokenFilter instead [ISSUE] #6717
• More resource efficient analysis wrapping usage #6714
• Add additional Analyzers, Tokenizers, and TokenFilters from Lucene #6693 (issue: #5935)
• Use non analyzed token stream optimization everywhere #6001
• Add support for char filters in the analyze API #5148

Bulk

• Add support for retrieving fields in bulk updates #12114 (issue: #11527)

CAT API

• Add scroll stats to cat API #12331 (issue: #12330)
• Add option to _cat/indices to return index creation date #11524 #11688 (issue: #11524)
• Add node id to _cat apis #10246 (issue: #10226)
• Mark shadow replicas with s in _cat/shards output #10023 (issue: #9772)
• Add total index memory in _cat/indices #7824 (issue: #7008)
• Add file descriptor details to cat/nodes #7655 (issue: #7652)
• Add configured thread pool sizes to _cat/thread_pool [ISSUE] #5366
• Added thread pool cat api #4906 (issue: #4907)
• RestTable.renderValue() doesn’t know about tera and peta [ISSUE] #4871
• Clean up cat headers #4853 (issue: #4852)

CRUD

• Allow GET access to _all field (return value was always null before) #6924
• Remove backward compatibility layer introduced in #6149 #6229 (issue: #6149)
• Provide more context variables in update scripts #5724 (issues: #1607, #2230, #2231)

Cache

• Left over from the query_cache to request_cache rename #12478
• Rename caches. #11893 (issue: #11569)
• Give the filter cache a smaller maximum number of cached filters. #11833
• Remove the query parser cache. #10856
• Don’t use the fixed bitset filter cache for child nested level filters, but the regular filter cache instead #9740 (issue: #8810)
• Use a smaller expected size when serializing query results #9485
• Use correct number of bytes in query cache accounting #9479
• Use a 1024 byte minimum weight for filter cache entries #8304 (issues: #8249, #8268)
• Immediately remove filter cache entries on cache clear #8289 (issue: #8285)
• Add hit and miss count to Query Cache #7355
• Warmer (search) to support query cache #7326
• Add a request level flag to control Query Cache #7167
• Add a periodic cleanup thread for IndexFieldCache caches #7015 (issue: #7010)

Circuit Breakers

• Add support for registering custom circuit breaker #8795
• Circuit Breakers: Log if CircuitBreaker is tripping #8050
• Include name of the field that caused a circuit break in the log and exception message #5841 (issue: #5718)
• Increase RamAccountingTermsEnum flush size from 1mb to 5mb #5335
• Add circuit breaker for parent/child id cache #5325 (issue: #5325)
• Add circuit breaker functionality to parent/child id field data cache [ISSUE] #5276

Cluster

• Remove double call to elect primaries #12147
• Rename MetaData.uuid → MetaData.clusterUUID and IndexMetaData.uuid→ IndexMetaData.indexUUID #11914 (issue: #11831)
• Add MetaData.uuid to ClusterState.toXContent #11832
• Remove scheduled routing #11776
• Reset registeredNextDelaySetting on reroute #11759
• Add Unassigned meta data #11653
• Remove deprecated METADATA cluster block level #10779 (issue: #9203)
• Make routing_nodes an independent metric option in cluster state api #10412 (issue: #10352)
• Add support for cluster state diffs #10212
• Add METADATA_READ and METADATA_WRITE blocks #9203 (issues: #10521, #10522, #2833, #3703, #5855, #5876, #8102)
• Don’t mark cluster health as timed out if desired state is reached #8683
• Add missing cluster blocks handling for master operations #7763 (issue: #7740)
• Master election should demotes nodes which try to join the cluster for the first time #7558 (issue: #7493)
• Do not use a background thread to disconnect node which are removed from the ClusterState #7543
• Refactored ClusterStateUpdateTask protection against execution on a non master #7511 (issue: #7493)
• Remove unneeded cluster state serialization during cluster join #6949
• Resend failed shard messages when receiving a cluster state still referring to the failed shards #6881
• Send shard exists requests if shard exists locally but is not allocated to the node #6870
• Don’t attempt to start or fail shard if no master node can be found #6841
• Improve handling of failed primary replica handling #6825 (issue: #6808)
• Add local node to cluster state #6811
• During relocation, process pending mapping update in phase 2 #6762 (issue: #6648)
• Improve pending api to include current executing class #6744
• Start Master|Node fault detection pinging immediately during discovery #6706 (issue: #6480)
• Clean shard bulk mapping update to only use type name #6695
• Ensure index.version.created is consistent #6660
• Refactored AckedClusterStateUpdateTask & co. to remove code repetitions in subclasses #6559
• Wait till node is part of cluster state for join process #6480
• Do not use versions to optimize cluster state copying for a first update from a new master #6466
• Improve cluster update settings api #6244
• When sending shard start/failed message due to a cluster state change, use the master indicated in the new state rather than current #6189
• Raise node disconnected even if the transport is stopped #5918
• Moved the updateMappingOnMaster logic into a single place. #5850 (issue: #5798)
• A new ClusterStateStatus to indicate cluster state life cycles #5741
• Optimize multiple cluster state processing on receiving nodes [ISSUE] #5139
• Introduced a new IMMEDIATE priority - higher than URGENT #5098 (issue: #5062)
• Bulk process of shard started/failed should not execute on already processed events [ISSUE] #5061

Core

• Improve jvmcheck error failure #12696
• Use explict flag if index should be created on engine creation #12671
• Move Streams.copyTo(String|Bytes)FromClasspath() into StreamsUtils #12598
• Improve toString on EsThreadPoolExecutor #12535 (issue: #9732)
• Carry over shard exception failure to master node #12263
• Allow IBM J9 2.8+ in version check #11850
• Use System.nanoTime for ThreadPool’s estimated time, since it’s less likely to go backwards #11626
• Cleanup MergeScheduler infrastrucutre #11602
• Reduce shard inactivity timeout to 5m #11479 (issues: #11179, #11336)
• Fail shard if search execution uncovers corruption #11440 (issue: #11419)
• Acquire IndexWriter’s write.lock lock before shard deletion #11127 (issue: #11097)
• Ban PathUtils.get (for now, until we fix the two remaining issues) #11069 (issues: #11065, #11068)
• Refactor SSD/FileStore logic out of NodeEnvironment #10755 (issue: #10717)
• Refactor TransportShardReplicationOperationAction #10749 (issue: #10032)
• Make getFileStore a bit more defensive #10696
• Ref count write operations on IndexShard #10610
• Rename START phase into VERIFY_INDEX #10570
• Refresh if many deletes in a row use up too much version map RAM #10312 (issue: #7052)
• Add before/afterIndexShardDelete callbacks to index lifecycle #10173
• Move GatewayShardsState logic into IndexShard #10093
• Don’t rethrow already handled merge exceptions #10083
• NodeEnv should lock all shards for an index #9799
• Retry if shard deletes fail due to IOExceptions #9784
• Only do a single listAll from FileSwitchDir #9666 (issue: #6636)
• Consolidate index / shard deletion in IndicesService #9605
• Increase default xlog flush size from 200mb to 512 mb #9341 (issue: #9265)
• Pass through all exceptions in IndicesLifecycleListeners #9330
• Pass index settings to IndicesLifecycle#beforeIndexCreated and #afterIndexShardClosed #9245
• Delete shard content under lock #9083 (issues: #8608, #9009)
• Remove IndexEngine #8955
• Remove Gateway abstraction #8954
• Use Lucene’s defaults for compound file format #8934 (issue: #8919)
• Remove explicit .cleanUp() on cache clear #8924
• Cleanup LocalGatewayShardsState #8852
• Let Lucene kick off merges normally #8643
• Cut over MetaDataStateFormat to Path API in Gateway #8609
• Ensure shards are deleted under lock on close #8579
• Add before/after indexDeleted callbacks to IndicesLifecycle #8569 (issue: #8551)
• Free pending search contexts if index is closed #8551
• Ban all usage of Future#cancel(true) #8494
• Set bloom default to false even when Directory doesn’t have a codecService #8442
• Introduce shard level locks to prevent concurrent shard modifications #8436
• Observe cluster state on health request #8350
• Remove usage of Directory#fileExists #8233
• Introduce a RefCounted interface and basic impl #8210
• Use 1 instead of 0 as filler version value for nested docs #8145
• Add cluster and index state checksums #8010 (issue: #7586)
• Resiliency: Perform write consistency check just before writing on the primary shard #7873
• Add ActionRunnable support to ThreadPool to simplify async operation on bounded threadpools #7765
• Change the default cache filter impl from FixedBitSet to WAH8DocIdSet #7577 (issues: #6280, #7037)
• Verify checksums on merge #7360
• Change numeric data types to use SORTED_NUMERIC docvalues type #6967
• Disable loading of bloom filters by default #6959 (issues: #6298, #6349)
• Don’t close/reopen IndexWriter when changing RAM buffer size #6856
• Don’t acquire dirtyLock on autoid for create #6584
• Reuse Lucene’s TermsEnum for faster _uid/version lookup during indexing #6298 (issue: #6212)
• Entirely cut over to TopDocs#merge for merging shard docs in the reduce phase #6197
• Don’t use AllTokenStream if no fields were boosted [ISSUE] #6187
• Remove SerialMergeScheduler [ISSUE] #6120
• Throttling incoming indexing when Lucene merges fall behind [ISSUE] #6066
• Use Lucene built-in checksumming [ISSUE] #5924
• Don’t lookup version for auto generated id and create #5917
• Use Lucene’s defaults for CMS settings #5912 (issue: #5882)
• Change default merge throttling to 50MB / sec #5902
• Don’t lookup version for auto generated id and create #5785
• Prevent fsync from creating 0-byte files #5746
• Move to use serial merge schedule by default #5447
• Force merges to not happen when indexing a doc / flush #5319
• Reuse pages more agressively in BigArrays. #5300 (issue: #5299)

Dates

• Default date formats to use underscores via PUT #12509 (issue: #12429)
• Allow for backwards compatibility for unix timestamp in pre 2.x indices #11515 (issue: #10971)
• Allow for negative unix timestamps #11482 (issues: #11478, #11692)
• More strict parsing of ISO dates #6227 (issue: #6158)

Discovery

• Wait on incoming joins before electing local node as master #12161
• Don’t join master nodes or accept join requests of old and too new nodes #11972 (issue: #11924)
• Prevent over allocation for multicast ping request #10896
• Unicast Ping should close temporary connections after returning ping results #10849
• Prevent stale master nodes from sharing dated cluster states to nodes that have moved to a different master node #9632
• Publishing timeout to log at WARN and indicate pending nodes #9551
• Concurrent node failures can cause unneeded cluster state publishing #8933 (issue: #8804)
• Client: Only fetch the node info during node sampling #8685
• Don’t wait joinThread when stopping #8359 (issue: #8327)
• Improve handling of multicast binding exceptions #8243 (issue: #8225)
• Simplify discovery node initialization if version is unknown #8055 (issue: #8051)
• Remove MasterFaultDetection.Listener.notListedOnMaster #7995
• Only accept unicast pings once started #7950
• Add a finalize round to multicast pinging #7924
• During discovery, master fault detection should fall back to cluster state thread upon error #7908 (issue: #7834)
• Close ping handler’s executor service properly #7903
• NodesFD: simplify concurrency control to fully rely on a single map #7889
• During discovery, remove any local state and use clusterService.state instead #7834
• Update ZenDiscovery fields via the cluster service update task. #7790
• Give a unique id to each ping response #7769
• UnicastZenPing don’t rename configure host name #7747 (issue: #7719)
• Node join requests should be handled at lower priority than master election #7733
• Not all master election related cluster state update task use Priority.IMMEDIATE #7718
• Accumulated improvements to ZenDiscovery #7493 (issue: #2488)
• UnicastZenPing should also ping last known discoNodes #7336
• With unicast discovery, only disconnect from temporary connected nodes #6966
• During discovery, verify connect when sending a rejoin cluster request #6779
• Have a dedicated join timeout that is higher than ping.timeout for join #6342
• Unicast discovery enhancement #5508

Engine

• Pre sync flush cleanups #11252
• Remove flushNeeded in favor of IW#hasUncommittedChanges() #11225
• Remove the ability to flush without flushing the translog #11193
• Make SearchFactory static class in InternalEngine #11154
• Move back to single EngineConfig #10586 (issue: #10584)
• Remove reflection call to waitForMerges #10102
• Always fail engine on corruption #10092
• Move InternalEngine.segmentStats() into abstract Engine #9728 (issue: #9727)
• Move more methods into abstract Engine #9717
• Move as much as possible into abstract Engine #9678
• Factor out settings updates from Engine #9625
• Close Engine immediately if a tragic event strikes. #9616 (issue: #9517)
• Refactor InternalEngine into abstract Engine and classes #9585
• Remove FlushType and make resources final in InternalEngine #9565
• Remove dirty flag and force boolean for refresh #9484
• Simplify Engine construction and ref counting #9211
• Fold engine into IndexShard #9181
• Don’t acquire Engine’s readLock in segmentsStats #8910 (issue: #8905)
• Remove engine related command classes #8900
• Allow InternalEngine to be stopped and started #8784 (issue: #8720)
• Flush IndexWriter to disk on close and shutdown #7563
• Ensure close is called under lock in the case of an engine failure #5800
• Fail the engine/shard when refresh failed #5633

Exceptions

• Improve startup exceptions (especially file permissions etc) #13050
• Fix formatting of startup/configuration errors #13029
• Add serialization support for InterruptedException #12981
• Include stacktrace in rendered exceptions #12260 (issue: #12239)
• Render structured exceptions in mget / mpercolate #12240
• Add index name to the upgrade exception #12213
• Promote headers to first class citizens on exceptions #12006
• Parameterized exception messages #11981
• Carry on rest status if exceptions are not serializable #11973
• Render strucutred exception in multi search #11849
• Reduce the size of the XContent parsing exception #11642
• Remove ElasticsearchIAE and ElasticsearchISE #10862 (issue: #10794)
• Improve exception handling in transport local execution #10554
• Fix typo when primary is not available to index a document (UnavailableShardsException) #10140
• Change IndexPrimaryShardNotAllocatedException from 409 to 500 #7987 (issue: #7632)
• Nest original exception while creating NoShardAvailableActionException #7757 (issue: #7756)
• Improve exception from Store.failIfCorrupted #7695 (issue: #7596)
• Introduced a new elasticsearch exception family that can hold headers #7269
• Better message for invalid internal transport message format #6916
• Function Score: Add missing whitespace in error message when throwing exception #6155

Fielddata

• Consult field info before fetching field data #12403
• Remove the dependecy on IndexFielddataService from MapperService. #12371
• Enable doc values by default, when appropriate #10209 (issue: #8312)
• Change threshold value of fielddata.filter.frequency.max/min #9522 (issue: #9327)
• Fielddata: Remove custom comparators and use Lucene’s instead #6981 (issue: #5980)
• Switch fielddata to use Lucene doc values APIs. #6908
• Make BytesValues.WithOrdinals more similar to Lucene’s SortedSetDocValues #6524
• Don’t expose hashes in Fielddata anymore. #6500
• Add a dedicated field data type for the _index field mapper. #6073 (issue: #5848)
• Provide meaningful error message if field has no fielddata type #5979 (issue: #5930)
• Use segment ordinals as global ordinals if possible #5873 (issue: #5854)
• Make use of global ordinals in parent/child queries #5846
• Added a AppendingDeltaPackedLongBuffer-based storage format to single value field data #5706
• Remove AtomicFieldData.isValuesOrdered. #5688
• Add global ordinals #5672
• Moved the decision to load p/c fielddata eagerly to a better place. #5569

Geo

• Update ShapeBuilder and GeoPolygonQueryParser to accept non-closed GeoJSON #11161 (issue: #11131)
• Remove local Lucene Spatial package #10966
• Add merge conflicts to GeoShapeFieldMapper #10533 (issues: #10513, #10514)
• Coordinates can contain more than two elements (x,y) in GeoJSON parser. #9542 (issue: #9540)
• Revert "[GEO] Update GeoPolygonFilter to handle ambiguous polygons" #9463 (issues: #5968, #9304, #9339, #9462)
• Update GeoPolygonFilter to handle polygons crossing the dateline #9339 (issues: #5968, #8672, #9304)
• GeoPolygonFilter not properly handling dateline and pole crossing #9171 (issue: #5968)
• Removing unnecessary orientation enumerators #9036 (issues: #8978, #9035)
• Add optional left/right parameter to GeoJSON #8978 (issue: #8764)
• Feature/Fix for OGC compliant polygons failing with ambiguity #8762 (issue: #8672)
• Fixes BoundingBox across complete longitudinal range #7340 (issue: #5218)
• Adds support for GeoJSON GeometryCollection #7123 (issue: #2796)
• Added caching support to geohash_filter #6478
• Allow to parse lat/lon as strings and coerce them #5626
• Improve error detection in geo_filter parsing #5371 (issue: #5370)
• Improve geo distance accuracy [ISSUE] #5192
• Add support for distances in nautical miles #5088 (issue: #5085)

Highlighting

• Highlighting: keep track of the original query only in HighlighterContext #11317
• Make the HighlightQuery class public #6446
• Highlight fields in request order #6178 (issue: #4649)

Index APIs

• Show human readable Elasticsearch version that created index and date when index was created #11509 (issue: #11484)
• Add check to MetaData#concreteIndices to prevent NPE #10342 (issue: #10339)
• Set maximum index name length to 255 bytes #8158 (issue: #8079)
• Add wait_if_ongoing option to _flush requests #6996
• Unified MetaData#concreteIndices methods into a single method that accepts indices (or aliases) and indices options #6169
• Fix detection of unsupported fields with validate API #5782 (issue: #5685)

Index Templates

• Provide template usage information on index creation #8646 (issue: #7421)
• Unified PUT/POST behaviour in relation to create parameter #6429

Indexed Scripts/Templates

• Indexed scripts/templates: return response body when script is not found #10396 (issue: #7325)
• Make sure headers are handed over to internal requests and streamline versioning support #7569
• Use preference("_local") on get calls. #7477
• Indexed Scripts/Templates: Return error message on 404 #7335 (issue: #7325)

Inner Hits

• Nested parent field should be resolved based on the parent inner hit definition #9251 (issue: #8153)
• Added another more compact syntax for inner hits. #8770

Internal

• Cleanup bootstrap package. #13053 (issue: #13044)
• Drop commons-lang dependency #12972
• Flatten IndicesModule and add tests #12921 (issue: #12783)
• Flatten ClusterModule and add more tests #12916 (issue: #12783)
• Allow a plugin to supply its own query cache implementation #12881
• Remove Environment.resolveConfig #12872
• Remove ClassLoader from Settings #12868
• Transport: allow to de-serialize arbitrary objects given their name #12571
• Add RealtimeRequest marker interface to group realtime operations together #12537
• Forbid Files.isHidden. #12484 (issue: #12465)
• Remove unused QueryParseContext argument in MappedFieldType#rangeQuery() #12417
• Simplify Replica Allocator #12401
• Replace primaryPostAllocated flag and use UnassignedInfo #12374
• Add the ability to wrap an index searcher. #12364
• Cleanup TransportSingleShardAction and TransportInstanceSingleOperationAction #12361
• Remove TransportSingleCustomOperationAction in favour of TransportSingleShardAction #12350
• updated the elasticsearch versioning format #12210
• Cleanup the data structures used in MetaData class for alias and index lookups #12202
• Make 2.0.0.beta1-SNAPSHOT the current version. #12151 (issue: #12148)
• Remove mapper references from Engines #12130
• Cleanup ShardRoutingState uses and hide implementation details of ClusterInfo #12126
• Consolidate ShardRouting construction #12125
• Change JarHell to operate on Path instead of URL #12109
• Refactor MetaData to split off the concrete index name logic to a dedicated service #12058
• really ban exitVM with security policy #11982
• Cut over to writeable for TransportAddress #11949
• Internal: make sure ParseField is always used in combination with parse flags #11859
• Remove XContentParser.map[Ordered]AndClose(). #11846
• Remove reroute with no reassign #11804
• Use abstract runnable in scheduled ping #11795
• Mark store as corrupted instead of deleting state file on engine failure #11769
• Add DateTime ctors without timezone to forbidden APIs #11743
• Fold ShardGetService creation away from Guice into IndexShard #11606
• Create ShardSuggestService/Metrics manually outside of guice #11605
• Minimize the usage of guava classes in interfaces, return types, arguments #11501
• Make CompressedXContent.equals fast again. #11428 (issue: #11247)
• Consolidate shard level modules without logic into IndexShardModule #11416
• Serialization: Remove old version checks #11397
• Catch UnsatisfiedLinkError on JNA load #11385
• Deduplicate field names returned by simpleMatchToFullName & simpleMatchToIndexNames in FieldMappersLookup #11377 (issue: #10916)
• Rename TransportShardReplicationOperationAction to TransportReplicationAction #11332
• Absorb ImmutableSettings into Settings #11321 (issue: #7633)
• Make some sec mgr / bootup classes package private and final. #11312
• Tighten up our compression framework. #11279
• Uid#createTypeUids to accept a collection of ids rather than a list #11263
• Remove need for generics in ContextAndHeaderHolder #11222
• Remove dependency on hppc:esoteric. #11144
• Improve path mgmt on init, better error messages, symlink support #11106
• Ensure JNA is fully loaded when its available, but don’t fail its not #10989
• Transport: read/writeGenericValue to support BytesRef #10878
• Remove Preconditions class #10873
• Remove index/indices replication infra code #10861
• Wait forever (or one day) for indices to close #10833 (issue: #10680)
• Reduce code duplication in TransportIndexAction/TransportShardBulkAction. #10819
• Don’t create a new BigArrays instance for every call of withCircuitBreaking #10800 (issue: #10798)
• Change BigArrays to not extend AbstractComponent #10798
• Use Tuple only as return value in Bootstrap #10784
• CommitStats doesn’t need to allow for null values in commit user data #10774 (issue: #10687)
• Prevent injection of unannotated dynamic settings #10763 (issue: #10614)
• Refactor and cleanup transport request handling #10730
• Add fairness option to KeyedLock. #10703
• Cleanup local code transport execution #10582
• Make APIs work per-segment like Lucene’s Collector. #10389
• Transport: shortcut local execution #10350 (issue: #10247)
• Fix string comparisons #10204
• Remove unsafe field in BytesStreamInput #10157
• Make assert less strict to ensure local node is not null #10076
• Use provided cluster state for indices service validations #10014
• Fix Java 8 _ variable warning #10013
• Stop passing default cluster name to cluster state read operations #9888
• Add missing @Override annotations. #9832
• Some more simple fs cleanups. #9827
• Fix errors reported by error-prone #9817
• Remove redundant fs metadata ops. #9807
• Removed Master from names.txt #9698 (issue: #9687)
• Remove XCollector. #9677
• Introduce TimedPrioritizedRunnable base class to all commands that go into InternalClusterService.updateTasksExecutor #9671 (issues: #8077, #9354)
• Search: Reuse Lucene’s MultiCollector. #9549
• Add beforeIndexAddedToCluster callback #9514
• Remove HandlesStreamInput/Output #9486
• Add AliasesRequest interface to mark requests that manage aliases #9460
• ClusterInfoService should wipe local cache upon unknown exceptions #9449
• Fix shard state tranport action names #9440 (issue: #7105)
• Minor hygiene, Removed Redundant inheritance #9427
• Clean up memory reuse a bit. #9272
• Remove includeExisting flag from adding ObjectMapper and FieldMapper listeners #9184
• Reduce the size of the search thread pool. #9165 (issue: #9135)
• Assert that we do not call blocking code from transport threads #9164
• Remove reduced stack size and use JVM default instead #9158 (issue: #9135)
• Remove IndexCloseListener & Store.OnCloseListener #9009 (issues: #8436, #8608)
• Remove circular dependency between IndicesService and IndicesStore #8918
• Remove some Internal* abstractions #8904
• Remove action names bwc layer #8758 (issue: #7105)
• Add File.java to forbidden APIs #8666
• Inverse DocIdSets' heuristic to find out fast DocIdSets. #8380
• Temporarily ban buggy IOUtils methods with forbidden #8375
• Refactor shard recovery from anonymous class to ShardRecoveryHandler #8363
• Make indexQueryParserService available from ParseContext #8252 (issue: #8248)
• Allow to configure custom thread pools #8247
• Expose concurrency_level setting on all caches #8112 (issue: #7836)
• Resiliency: Be more conservative if index.version.created is not set #8018
• Split internal fetch request used within scroll and search #7870 (issues: #6933, #7319, #7856)
• Never send requests after transport service is stopped #7862
• Split internal free context request used after scroll and search #7856 (issues: #6933, #7319)
• Clarify when a shard search request gets created to be only used locally #7855
• Add a listener thread pool #7837
• Remove unused ForceSyncDirectory #7804
• Force execution of delete index requests #7799
• Check if from + size don’t cause overflow and fail with a better error #7778 (issue: #7774)
• Make sure that internally generated percolate request re-uses the original headers and request context #7767
• Make sure that update internal requests share the same original headers and request context #7766
• Make sure that all delete mapping internal requests share the same original headers and context #7736
• Added scrollId/s setters to the different scroll requests/responses #7722
• Make sure that original headers are used when executing search as part of put warmer #7711
• Refactor copy headers mechanism to not require a client factory #7675 (issue: #7594)
• In thread pools, use DirectExecutor instead of deprecated API #7636
• Change LZFCompressedStreamOutput to use buffer recycler when allocating encoder #7613
• Introduced a transient context to the rest request #7610
• Refactor copy headers mechanism in REST API #7594 (issue: #6513)
• Deduplicate useful headers that get copied from REST to transport layer #7590
• Remove DocSetCache. #7582
• Extract a common base class for (Master|Nodes)FaultDetection #7512 (issue: #7493)
• Removing useless methods and method parameters from ObjectMapper.java and TypeParsers.java #7474 (issue: #7271)
• Extended ActionFilter to also enable filtering the response side #7465
• Removed ConcurrentHashMapV8 #7392 (issues: #6400, #7296)
• Move index templates api back to indices category and make put template and create index implement IndicesRequest #7378
• Make sure that multi_search request hands over its context and headers to its corresponding search requests #7374
• Make sure that multi_percolate request hands over its context and headers to its corresponding shard requests #7371
• Clarify XContentParser/Builder interface for binary vs. utf8 values #7367
• Remove CacheRecycler. #7366
• Get request while percolating existing documents to keep around headers and context of the original percolate request #7333
• Auto create index to keep around headers and context of the request that caused it #7331
• Switch to fixed thread pool by default for management threads #7320 (issue: #7318)
• Make sure that all shard level requests hold the original indices #7319
• Refactored TransportMessage context #7303
• Made it possible to disable the main transport handler in TransportShardSingleOperationAction #7285
• Adjusted BroadcastShardOperationResponse subclasses visibility #7255
• Add some @Nullable annotations and fix related compilation warnings. #7251
• Adjusted visibility for BroadcastShardOperationRequest subclasses and their constructors #7235
• Changed every single index operation to not replace the index within the original request #7223
• Adjusted TermVectorRequest serialization to not serialize and de-serialize the index twice #7221
• Refactored TransportSingleCustomOperationAction, subclasses and requests #7214
• Removed needless serialization code from TransportIndexReplicationAction and corresponding request object #7211
• Added transient header support for TransportMessage #7187
• Check for null references that may be returned due to concurrent changes or inconsistent cluster state #7181
• Better categorization for transport actions #7105
• Added a cli infrastructure #7094
• Introduced the notion of a FixedBitSetFilter that guarantees to produce a FixedBitSet #7037 (issue: #7031)
• Remove use of recycled set in filters eviction #7012
• Refactor TransportActions #6989
• Expose the indices names in every action relates to if applicable #6933
• Rename FieldMapper.termsFilter to fieldDataTermsFilter. #6888
• Make XContentBuilder Releasable #6869
• Remove (mostly) unused failure member from ShardSearchFailure. #6861 (issue: #6837)
• Use KeyedLock in IndexFieldDataService #6855
• Cleanup of the transport request/response messages #6834
• Don’t replace indices within ActionRequest and check blocks against concrete indices #6777 (issues: #1, #2)
• Separate parsing implementation from setter in SearchParseElement #6758 (issue: #3602)
• Remove intern calls on FieldMapper#Names for better performance #6747
• Disable explicit GC by default #6637
• Make sure we don’t reuse arrays when sending an error back #6631
• Wrap RateLimiter rather than copy RateLimitedIndexOutput #6625
• Re-shade MVEL as a dependency #6570
• Copy the headers from REST requests to the corresponding TransportRequest(s) #6513 (issue: #6464)
• Better default size for global index → alias map #6504
• Use ConcurrentHashMapV8 for lower memory overhead #6400
• Made base64 decode parsing to detect more errors #6348 (issue: #6334)
• Change the default type of the page recycler to CONCURRENT instead of SOFT_CONCURRENT. #6320
• Some minor cleanups #6210
• Remove SoftReferences from StreamInput/StreamOutput #6208
• Use t-digest as a dependency. #6142
• Add support for Byte and BytesRef to the XContentBuilder #6127
• Remove unused dump infra #6060
• Made it mandatory to specify IndicesOptions when calling MetaData#concreteIndices #6059
• Limit the number of bytes that can be allocated to process requests. #6050
• Fix code typo in FieldSortBuilder.java #5937
• Improved bloom filter hashing #5901
• Field data diet. #5874
• Cleanup FileSystemUtils #5806
• Make writePrimitive*() and readPrimitive*() methods public. #5710
• LongHash add/key not consistent [ISSUE] #5693
• Releasable bytes output + use in transport / translog #5691
• Make Releasable extend AutoCloseable. #5689
• Replaces usage of StringBuffer with StringBuilder #5606 (issue: #5605)
• Internally manipulate the terms execution hint as an enum instead of a String. #5530
• Let ByteArray/BigByteArray.get() indicate whether a byte[] was materialized. #5529
• BytesReference.Helper should never materialize a byte[] array. #5517
• Clean the query parse context after usage #5475
• BytesReference usage to properly work when hasArray is not available #5455
• MulticastChannel returned wrong channel in shared mode #5441
• New class PagedBytesReference: BytesReference over pages #5427 (issue: #5420)
• Rewrite BytesStreamOutput on top of BigArrays/ByteArray. #5331 (issue: #5159)
• Add tracking of allocated arrays. #5264
• Remove thread local recycler #5254
• Recycler: better lifecycle control for pooled instances #5217 (issue: #5214)
• Remove useless URL instantiation #5206
• Variable renamings to reduce unnecessary variable naming diversity #5075
• Add RamUsageEstimator#sizeOf(Object) to forbidden APIs #4975
• Remove redundant version checks in transport serialisation #4731

Java API

• PrefixQueryParser takes a String as value like its Builder #12204 (issue: #12032)
• Fix FuzzyQuery to properly handle Object, number, dates or String. #12020 (issue: #11865)
• Treat path object as a simple value instead of Iterable in XContentBuilder #11903 (issue: #11771)
• IdsQueryBuilder: Allow to add a list in addition to array #11409 (issue: #5089)
• Fix typed parameters in IndexRequestBuilder and CreateIndexRequestBuilder #11382 (issue: #10825)
• Unify SearchResponse and BroadcastOperationResponse code around shards header #11064
• Remove duplicated buildAsBytes and corresponding toString methods #11063
• Remove duplicated consistency level and replication type setters #10188
• Package private getters to become public if there have corresponding public setters #9273
• Add internal liveness action to transport client #8763
• Added utility method #8594
• Enabled overriding the request headers in the clients #8258
• Adding setters or making them public in ActionRequests #8123 (issue: #8122)
• Add indices setter to IndicesRequest interface #7734
• Mark transport client as such when instantiating #7552
• Allow nullable queryBuilder in FilteredQueryBuilder to match rest api #7398 (issue: #7365)
• Some PercolateRequest "setters" allow for method chaining, some don’t [ISSUE] #7294
• Throw IllegalStateException if you try to .addMapping for same type more than once #7243 (issue: #7231)
• XContentBuilder.map(Map) method modified to use a wildcard for value’s type. #7212
• Add suggestRequest to Requests and fix broken javadocs in client #7207 (issue: #7206)
• Add index, type and id to ExplainResponse #7201
• Add a blocking variant of close() method to BulkProcessor #6586 (issues: #4158, #6314)
• Client intermediate interfaces removal follow-up #6563 (issue: #6517)
• TransportClient: Improve logging, fix minor issue #6376
• flush method for BulkProcessor class. #5575 (issue: #5570)
• Add BoolFilterBuilder#hasClauses to be consitent with BoolQueryBuilder #5476 (issue: #5472)
• Allow iteration over MultiGetRequest#Item instances #5470 (issue: #3061)
• Java API does not have a way to set global highlighting settings [ISSUE] #5281

Logging

• Adds a setting to control source output in indexing slowlog #12806 (issue: #4485)
• Add more debugging information to the Awareness Decider #12490 (issue: #12431)
• Add shadow indicator when using shadow replicas #12399
• Log warn message if leftover shard is detected #11826
• Add -XX:+PrintGCDateStamps when using GC Logs #11735 (issue: #11733)
• ClusterStateObserver should log on trace on timeout #11722
• Better error messages when mlockall fails #11433
• Display low disk watermark to be consistent with documentation #11313 (issue: #10588)
• Add logging for failed TTL purges #11302 (issue: #11019)
• Add index name to log statements when settings update fails #11124
• Add logging of slow cluster state tasks #10907 (issue: #10874)
• Logging: add the ability to specify an alternate logging configuration location #10852 (issues: #2044, #7395)
• Log sending translog operation batches to nodes #10544
• Log only a summary line of filesystem detail for all path.data on node startup #10527 (issue: #10502)
• Add INFO logging saying whether each path.data is on an SSD #10502
• Use static logger name in Engine.java #10497
• Miscellaneous additional logging and cleanups #10376
• Fix logging a RoutingNode object, log an object with a good .toString instead #9863
• Logging: improve logging messages added in #9562 #9603 (issue: #9562)
• Change logging to warning to match pattern #9593
• Add logging around gateway shard allocation #9562
• Added a simple request tracer, logging incoming and outgoing Transport requests #9286
• Log when upgrade API starts and stops #9229 (issue: #9227)
• Reduce apache (cloud-aws) logging when rootLogger is DEBUG #8856
• Log byte and doc size for slow merges #8855 (issue: #8853)
• Separately log file deletions #8662 (issue: #8603)
• Clarify index removal log message #8641
• Add log4j-extras dependency #8464 (issue: #7927)
• Log how long IW.rollback took, and when MockFSDir starts its check index #8388
• Change log level for mpercolate #8306
• Suppress long mapping logging during mapping updates (unless in TRACE) #7949
• Add log4j-extras dependency #7947 (issue: #7927)
• Boostrap: Log startup exception to console if needed and to file as error #6581
• Log script change/add and removal at INFO level #6104
• Include thread name when logging IndexWriter’s infoStream messages #5973
• Tie in IndexWriter’s infoStream output to "lucene.iw" logger with level=TRACE #5934 (issue: #5891)
• Be less verbose logging ClusterInfoUpdateJob failures #5222
• Togglable stacktrace display #5187 (issues: #5102, #5103)
• Add EnhancedPatternLayout to logging.yml options #4991

Mapping

• Move the _size mapper to a plugin. #12582
• Remove index name from mapping parser #12352
• Remove AbstractFieldMapper #12089
• Completely move doc values and fielddata settings to field types #12014
• Move short name access out of field type #11977
• Rename "root" mappers to "metadata" mappers #11962
• Mappings: Remove close() from Mapper #11863
• Move merge simulation of fieldtype settings to fieldtype method #11783 (issue: #8871)
• Hide more fieldType access and cleanup null_value merging #11770 (issue: #11764)
• Replace fieldType access in mappers with getter #11764
• Remove SmartNameObjectMapper #11686
• Add equals/hashcode to fieldtypes #11644
• Shortcut exists and missing queries when no types/docs exist #11586
• Remove leftover sugar methods from FieldMapper #11565
• Make index level mapping apis use MappedFieldType #11559
• Move null value handling into MappedFieldType #11544
• Refactor core index/query time properties into FieldType #11422 (issue: #8871)
• Validate parsed document does not have trailing garbage that is invalid json #11414 (issue: #2315)
• Remove generics from FieldMapper #11292
• Cleanup field name handling #11272
• Remove document parse listener #11243
• Remove SmartNameFieldMappers #11216
• Make DocumentMapper.refreshSource() private. #11209
• Make mapping updates atomic wrt document parsing. #11205
• Remove the ignore_conflicts option. #11203
• Add back support for enabled/includes/excludes in _source field #11171 (issue: #11116)
• Make FieldNameAnalyzer less lenient. #11141
• Remove mapper listeners #11045
• Remove traverse functions from Mapper #11027
• Consolidate document parsing logic #10802
• Wait for required mappings to be available on the replica before indexing. #10786
• Join MergeResults with MergeContext since they are almost the same #10765
• Restrict murmur3 field type to sane options #10738 (issue: #10465)
• Simplify dynamic mappings updates. #10720 (issue: #10593)
• Simplified mapper lookups #10705 (issue: #8871)
• Remove dead code after previous refactorings #10666 (issue: #8877)
• Same code path for dynamic mappings updates and updates coming from the API. #10593 (issues: #8688, #9364, #9851)
• Add enabled flag for _field_names to replace disabling through index:no #9893
• Fix field mappers to always pass through index settings #9780
• Add ignore_missing option to timestamp #9104 (issues: #8882, #9049)
• Include currentFieldName into ObjectMapper errors #9020
• Store _timestamp by default. #8139
• Better validation of mapping JSON #7534 (issue: #7205)
• Make lookup structures immutable. #7486
• Report conflict when merging _all field mapping and throw exception when doc_values specified #7377 (issue: #777)
• Enforce non-null settings. #7032
• Control whether MapperService docMapper iterator should contain DEFAULT_MAPPING #6793
• Call callback on actual mapping processed #6748
• Improve performance for many new fields introduction in mapping #6707
• Better logic on sending mapping update new type introduction #6669
• Wait for mapping updates during local recovery #6666
• Check if root mapping is actually valid #6093 (issues: #4483, #5864)
• Support empty properties array in mappings #6006 (issue: #5887)
• Update default precision step, modulo tests #5908 (issue: #5905)
• Add lucene LMSimilarity #5701 (issue: #5697)
• Support externalValue() in mappers #4986
• Norms disabling on existing fields [ISSUE] #4813

More Like This

• Renamed ignore_like to unlike #11117
• Lenient default parameters #9412
• Remove MLT Field Query #8238
• Support for when all fields are deprecated #8067
• Add versatile like parameter #8039
• Replace percent_terms_to_match with minimum_should_match #7898
• Default to all possible fields for items #7382
• Switch to using the multi-termvectors API #7014
• Fetch text from all possible fields if none are specified #6740
• Ensure selection of best terms is indeed O(n) #6657
• Create only one MLT query per field for all queried items #6404
• Add the ability to specify the analyzer used for each Field #6329
• Added syntax for single item specification. #6311
• Values of a multi-value fields are compared at the same level #6310
• Replaced exclude with include to avoid double negation #6248
• Allow for both like_text and docs/ids to be specified. #6246
• Added the ability to include the queried document for More Like This API. #6067
• Fix behavior on default boost factor for More Like This. #6021
• Added searching for multiple similar documents #5857 (issue: #4075)

NOT CLASSIFIED

• Randomized testing version bump #7138
• Upgrade to Jackson 2.4.1.1 [ISSUE] #6789
• Upgrade to mvel 2.2.0.Final [ISSUE] #5877

Nested Docs

• Add min score mode to nested query #11909
• Added nested scope to parse context that keeps track the current nested level during search request parsing #9692 (issue: #9305)
• Fix support for named filters/queries inside nested filters. #6293

Network

• Don’t print lots of noise on IPv4 only hosts. #13026
• Remove support for address resolving in InetSocketTransportAddress #13020 (issue: #13014)
• Log network configuration at debug level #12979
• Use preferIPv6Addresses for sort order, not preferIPv4Stack #12951
• Make sure messages are fully read even in case of EOS markers. #11768 (issue: #11748)
• Add profile name to TransportChannel #11261 (issue: #10483)
• Default value for socket reuse should not be null #11255
• Make Netty exceptionCaught method protected #10464
• Remove content thread safe from REST layer #10429
• Add getter for channel in NettyTransportChannel #10319
• Schedule transport ping interval #10189
• Return useful error message on potential HTTP connect to Transport port #10108 (issue: #2139)
• Change access modifiers to protected in Netty HTTP Transport #9724
• Add profiles to Netty transport infos #9134
• Support binding on multiple host/port pairs #8098
• Chunk direct buffer usage by networking layer #7811
• Make sure channel closing never happens on i/o thread #7726
• Support "default" for tcpNoDelay and tcpKeepAlive #7136 (issue: #7115)
• Refactoring to make MessageChannelHandler extensible #6915 (issue: #6889)
• Refactoring to make Netty MessageChannelHandler extensible #6889
• Improve large bytes request handling by detecting content composite buffer #6756
• Use loopback when localhost is not resolved #5719

Packaging

• Bats testing: Remove useless systemctl check #12724 (issue: #12682)
• improve sanity of securitymanager file permissions #12609
• Remove Core Lib directory #12485 (issue: #12010)
• Do not kill process on service shutdown #12298 (issue: #11248)
• Improve JVM Arch Detection #12274 (issue: #12256)
• fail plugins on version mismatch #12221
• Allow use of bouncycastle #12102
• Give a better exception when a jar contains same classfile twice. #12093
• Don’t jarhell check system jars #11979
• detect jar hell before installing a plugin #11963 (issue: #11946)
• jar hell check should fail, if jars require higher java version #11936
• Fail startup (and tests) on jar hell #11932 (issue: #11926)
• Load plugins into classpath in bootstrap #11918 (issue: #11917)
• steps to remove dangerous security permissions #11898
• Packaging: Add LICENSE and NOTICE files for all core dependencies #11705 (issues: #10684, #2794)
• Export hostname as environment variable for plugin manager #11399 (issues: #10902, #9474)
• Use our provided JNA library, versus one installed on the system #11163
• Remove unnecessary permissions. #11132
• Tighten up script security more #10999
• Add pid file to Environment #10986
• Bail if ES is run as root #10970
• Remove exitVM permissions #10963
• Remove JNI permissions, improve JNI testing. #10962
• Remove shutdownHooks permission #10953
• Simplify securitymanager init #10936
• Exclude jackson-databind dependency #10924
• Remove reflection permission for sun.management. #10848 (issue: #10553)
• Security manager cleanups #10844
• Add common SystemD file for RPM/DEB package #10725
• Enable securitymanager #10717
• Remove working directory #10672
• Standardization of packages structure and install #10595 (issue: #10330)
• Add properties files to configure startup and installation scripts #10330
• Use direct mapping call in Kernel32Library #9923 (issue: #9802)
• service.bat file should explicitly use the Windows find command. #9532
• CliTool: Add command to warn on permission/owner change #9508
• Export the hostname as environment variable #9474 (issue: #8470)
• Windows: makes elasticsearch.bat more friendly to automated processes #9160 (issue: #8913)
• Shutdown: Add support for Ctrl-Close event on Windows platforms to grace… #8993
• Packaging: Add java7/8 java-package paths to init script #8815 (issue: #7383)
• Check if proc file exists before calling sysctl #8793 (issue: #4978)
• Factor out PID file creation and add tests #8775 (issue: #8771)
• deb: add systemd service config for upcoming Jessie #8765 (issue: #8493)
• bin/elasticsearch: add help, fix endless loop #8729 (issues: #2168, #7104)
• Allow configuration of the GC log file via an environment variable #8479 (issues: #8471, #8479)
• Introduce elasticsearch.in.bat (i.e. es.in for Windows) #8244 (issue: #8237)
• Make .zip and .tar.gz release artifacts contain same files #7578 (issue: #2793)
• Add default oracle jdk 7 (x64) path to JDK_DIRS #7132
• Prevent init script from returning when the service isn’t actually started #6909
• Windows: Modify command window title (windows) #6752 (issue: #6336)
• Remove java-6 directories from debian init script #6350
• Reset locale to C in bin/elasticsearch #6047
• Remove spaces from commented config lines in elasticsearch.yml and logging.yml [ISSUE] #5842
• Use the new command line syntax in the init script #5033
• Startup: Add ES_HOME to ES_INCLUDE search path #4958
• Mark lucene-expression as provided in pom.xml #4861 (issues: #4858, #4859)
• Move systemd files from /etc to /usr/lib #4029

Parent/Child

• Enforce _parent field resolution to be strict #9521 (issue: #9461)
• Reduce memory usage in top children query #8165
• Adding min score mode to parent-child queries #7771 (issue: #7603)
• Support min_children and max_children on has_child query/filter [ISSUE] #6019
• Fix P/C assertions for rewrite reader #5731
• Migrated p/c queries from id cache to field data. #4878 (issue: #4930)

Percolator

• Don’t cache percolator query on loading percolators #12862
• Change percolator.getTime → percolator.time #11954
• The query parse context should be fetched from the IndexQueryParseService #11929
• Introduce index option named index.percolator.map_unmapped_fields_as_string #9054 (issues: #9025, #9053)
• Remove index.percolator.allow_unmapped_fields setting. #8439
• Percolator should cache index field data instances. #7081 (issue: #6806)
• Reuse IndexFieldData instances between percolator queries #6845 (issue: #6806)
• Add MemoryIndex reuse when percolating doc with nested type #5332

Plugin Cloud AWS

• Don’t show access_key and filter_key in S3 repository settings #12845 (issues: #11265, #184)
• Add support for base_path in elasticsearch.yml #12761
• Adding retry when checking s3 snapshot repository #12498 (issue: #12462)
• Upgrade AWS dependency to 1.10.0 #11659

Plugin Cloud GCE

• Update to GCE API v1-rev71-1.20.0 [ISSUE] #12835

Plugins

• Lucene SPI support for plugins. #13051
• Ensure additionalSettings() do not conflict #12967
• Validate checksums for plugins if available #12888 (issue: #12750)
• Expose zen ElectMasterService as a Discovery extension point #12828
• Introduce a formal ExtensionPoint class to stream line extensions #12826
• Flatten Allocation modules and add back ability to plugin ShardsAllocators #12818 (issue: #12781)
• Apply additional plugin settings only if settings are not explicit #12796
• PluginManager: Do not try other URLs if specific URL was passed #12766
• PluginManager: Fix elastic.co download URLs, add snapshot ones #12641 (issue: #12632)
• Fix plugin script to allow spaces in ES_HOME #12610 (issue: #12504)
• PluginManager: Add Support for basic auth #12445
• Ensure logging configuration is loaded in plugin manager #12081 (issue: #12064)
• Simplify Plugin Manager for official plugins #11805
• Allow security rule for advanced SSL configutation #11751
• Use of default CONF_DIR/CONF_FILE in plugin install #10721 (issues: #10673, #7946)
• Always send current ES version when downloading plugins #10131
• FileSystemUtils: Only create backup copies if files differ #9592
• Add executable flag to every file in bin/ after install #7177
• Lucene version checker should use Lucene.parseVersionLenient #7056
• Introduced pluggable filter chain to be able to filter transport actions execution #6921
• Enables plugins to define default logging configuration for their needs. #6805 (issue: #6802)
• bin/plugin tests for missing plugin name when passing --url #6013 (issues: #5976, #5977)
• Check plugin Lucene version #4984
• Serving _site plugins do not pick up on index.html for sub directories #4850 (issue: #4845)
• Add version to plugins #4378 (issues: #2668, #2784)

Query DSL

• Remove attemped (not working) support for array in not query parser #12890
• simple query string: remove (not working) support for alternate formats #12798 (issue: #12794)
• RegexpQueryParser takes a String as value like its Builder #12200 (issue: #11896)
• Expose Lucene’s new TopTermsBlendedFreqScoringRewrite. #12129
• Default fuzzy transpositions to true #12090 (issue: #9278)
• Special case the _index field in queries #12027 (issue: #3316)
• Add support for query boost to SimpleQueryStringBuilder. #11696 (issue: #11274)
• Change geo filters into queries #11137
• Make the script filter a query. #11126
• Function score: Add default to field_value_factor #10845 (issue: #10841)
• Return positions of parse errors found in JSON #10837 (issue: #3303)
• Enable Lucene ranking behaviour for numeric term queries #10790 (issue: #10628)
• Add support for minimum_should_match to simple_query_string #9864 (issue: #6449)
• Raise an exception on an array of values being sent as the factor for a field_value_factor query #9246 (issue: #7408)
• function_score: use query and filter together #8675 (issue: #8638)
• Add option for analyzing wildcard/prefix to simple_query_strinq #8422 (issue: #787)
• Expose max_determinized_states in regexp query, filter #8384 (issue: #8357)
• FunctionScore: RandomScoreFunction now accepts long, as well a strings. #8311 (issue: #8267)
• Be stricter parsing ids for ids query #7945 (issue: #7686)
• Function Score: Add optional weight parameter per function #7137 (issue: #6955)
• Add time zone setting for relative date math in range filter/query #7113 (issue: #3729)
• Add support for the _name parameter to the simple_query_string query #6979
• Function score parser should throw exception if both functions:[] and single function given #5995
• Refactor SimpleQueryParser settings into separate Settings class, add "lenient" option #5208 (issue: #5011)
• Throw parsing exception if terms filter or query has more than one field #5137 (issue: #5014)
• Add "locale" parameter to query_string and simple_query_string #5131 (issue: #5128)
• Add support for lowercase_expanded_terms flag to simple_query_string #5126 (issue: #5008)
• Add fuzzy/slop support to simple_query_string #4985
• Range filter no cache behaviour for now with rounding #4955 (issues: #4846, #4947)
• Expose dist/pre/post options for SpanNotQuery #4452

REST

• Suppress rest exceptions by default and log them instead #12991
• Create Snapshot: remove _create from POST path to match PUT #11928 (issue: #11897)
• Add rewrite query parameter to the indices.validate_query API spec #11580 (issue: #10147)
• Unify query_string parameters parsing #11057
• HttpServer: Support relative plugin paths #10975 (issue: #10958)
• Remove global source parameter from individual APIs in REST spec #10863
• Add more utilities for source/body handling in RestAction #10724
• Add option to only return simple exception messages #10117
• Better detection of CBOR #10026 (issue: #7640)
• Expose master_timeout flag on GET _template & HEAD _template #9688
• Add support for multi-index query parameters for _cluster/state #9295 (issue: #5229)
• Remove indices_boost URL param #9244 (issue: #6281)
• Support JSON request body in scroll, clear scroll, and analyze APIs #9076 (issue: #5866)
• Adds parameters to API endpoint cluster put settings specification #8769
• Added _shards header to all write responses. #7994
• Changed the root rest endpoint (/) to use cluster service #7933 (issue: #7899)
• Add the cluster name to the "/" endpoint #7524
• A content decompressor that throws a human readable message when #7241
• Added missing percolate API parameters to the rest spec #7173
• Add REST API spec for /_search_shards endpoint #5907
• Rest layer refactoring phase 2 + recycling in http layer #5708
• Add explain flag support to the reroute API #5027 (issues: #2483, #5169)
• Throw exception if an additional field was placed inside the "query" body #4913 (issue: #4895)
• REST API: Consistent get field mapping response #4822 (issue: #4738)
• Rest API: Ensure 503 signals == retry on another node [ISSUE] #4066

Recovery

• Reduce cluster update reroutes with async fetch #11421
• Check if the index can be opened and is not corrupted on state listing #11269 (issue: #11226)
• No need to send mappings to the master node on phase 2. #11207
• Allow to recover into a folder containing a corrupted shard #10558
• Integrate translog recovery into Engine / InternalEngine #10452
• Only cancel recovery when primary completed relocation #10218
• Wipe shard state before switching recovered files live #10179 (issue: #10053)
• Engine: update index buffer size during recovery and allow configuring version map size #10046 (issues: #6363, #6667)
• Unify RecoveryState management to IndexShard and clean up semantics #9902 (issue: #9503)
• Only iterate the files that we recovered from the commit #9761
• Add a timeout to local mapping change check #9575
• Node shut down during the last phase of recovery needlessly fails shard [ISSUE] #9496
• Flush immediately after a remote recovery finishes (unless there are ongoing ones) #9439
• Don’t throttle recovery indexing operations #9396 (issue: #9394)
• Release store lock before blocking on mapping updates #9102
• Ensure shards are identical after recovery #8723
• Be more resilient to partial network partitions #8720
• Throw IndexShardClosedException if shard is closed #8648
• Allow to cancel recovery sources when shards are closed #8555
• Refactor RecoveryTarget state management #8092 (issues: #7315, #7893)
• During recovery, mark last file chunk to fail fast if payload is truncated #7830
• Remove unneeded waits on recovery cancellation #7717
• Set a default of 5m to recover_after_time when any of the expected*Nodes is set #6742
• Add a best effort waiting for ongoing recoveries to cancel on close #6741
• Cancel recovery if shard on the target node closes during recovery operation #6645
• RecoveryID should not be a per JVM but per Node #6207
• Before deleting a local unused shard copy, verify we’re connected to the node it’s supposed to be on #6191
• Change default recovery throttling to 50MB / sec #5913
• Fail replica shards locally upon failures #5847 (issue: #5800)

Scripting

• Allow scripts to expose whether they use the _score. #12695
• Add path.scripts directory #12668
• Simplify CacheKey used for scripts #12092
• Allow executable expression scripts for aggregations #11689 (issue: #11596)
• Unify script and template requests across codebase #11164 (issues: #10113, #10810, #11091)
• Minor TimeZone Fix #10994
• Run groovy scripts with no permissions #10969
• Add Field Methods #10890
• Remove groovy sandbox #10480 (issue: #10156)
• Allow plugins to define custom operations that they use scripts for #10419 (issue: #10347)
• Add String to the default whitelisted receivers #9837 (issue: #8866)
• Make script.groovy.sandbox.method_blacklist_patch truly append-only #9473
• Make groovy sandbox method blacklist dynamically additive #9470
• Add explicit error message when script_score script returns NaN #8750 (issue: #2426)
• Add explainable script again #8665 (issues: #7245, #8561)
• Use groovy-x.y.z-indy jar for better scripting performance #8183 (issue: #8182)
• Add GroovyCollections to the sandbox whitelist #7250 (issues: #7088, #7089)
• Make ScoreAccessor utility class publicly available for other script engines #6898 (issue: #6864)
• Remove setNextScore in SearchScript. #6864
• Add a transformer to translate constant BigDecimal to double #6609
• Add Groovy sandboxing for GString-based method invocation #6596
• Fix optional default script loading #6582
• Exposed _uid, _id and _type fields as stored fields (_fields notation) #6406

Search

• Split SearchModule.configure() into separate methods #12827
• Only compute scores when necessary with FiltersFunctionScoreQuery. #12707
• Speed up the function_score query when scores are not needed. #12693
• Make fetch sub phases pluggable #12400 (issue: #10729)
• Add _replica and _replica_first as search preference. #12244 (issue: #12222)
• Add global search timeout setting #12211 (issue: #12149)
• Term Query: Be more strict during parsing #12195 (issue: #12184)
• Clean up handling of missing values when merging shard results on the coordinating node. #12127 (issue: #9155)
• Always return metadata in get/search APIs. #11816 (issue: #8068)
• Search preference based on node specification #11464 (issue: #5925)
• Do not specialize TermQuery vs. TermsQuery. #11308
• Minor refactor of MultiValueMode removing apply and reduce #11290
• Make FilteredQuery a forbidden API. #11224 (issue: #6511)
• Count api to become a shortcut to the search api #11198 (issues: #9110, #9117)
• Make SCAN faster. #11180
• Remove (dfs_)query_and_fetch from the REST API #10864 (issue: #9606)
• Cut over to IndexSearcher.count. #10674
• Single value numeric queries shouldn’t be handled by NumericRangeQuery #10648 (issue: #10646)
• Query scoring change for single-value queries on numeric fields #10631 (issue: #10628)
• Remove unused normsField from MatchAllQuery #10592
• Replace deprecated filters with equivalent queries. #10531 (issue: #8960)
• Avoid calling DocIdSets.toSafeBits. #9546
• Merge search_type=count and size=0. #9296 (issue: #7630)
• Parse terms filters on a single term as a term filter. #9014
• Close active search contexts on SearchService#close() #8947 (issue: #8940)
• Surgically removed slow scroll #8780
• Filter cache: add a _cache: auto option and make it the default. #8573 (issue: #8449)
• Do not force the post-filter to be loaded into a BitSet. #8488
• Reduce memory usage during fetch source sub phase #8138
• Don’t let took be negative. #7968
• Switch to Lucene QueryRescorer #7707 (issue: #6232)
• Use FixedBitSetFilterCache for delete-by-query #7581 (issue: #7037)
• Speed up string sort with custom missing value #7005
• Wrap filter only once in ApplyAcceptedDocsFilter #6873
• Remove Queries#optimizeQuery - already handled in BooleanQuery #6743
• Improve 404 on missing scroll id #6063 (issue: #6040)
• Return missing (404) if a scroll_id is cleared that no longer exists. #5865 (issue: #5730)
• Speed up exists and missing filters on high-cardinality fields [ISSUE] #5659
• Freq terms enum #5597
• Capture and set start time in Delete By Query operations #5540
• Add dedicated /_search/template endpoint for query templates #5353
• Add failures reason to delete by query response #5095 (issue: #5093)
• Use patched version of ReferenceManager to prevent infinite loop in ReferenceManager#acquire() #5043
• Improve scroll search by using IndexSearcher#searchAfter(…) #4968 (issue: #4940)

Settings

• Throw Exception for missing settings file #12833 (issue: #11510)
• Remove lenient store type parsing #12735
• Add path.shared_data #12729 (issues: #11065, #12714)
• Add node setting to send SegmentInfos debug output to System.out #11546
• ResourceWatcher: Rename settings to prevent watcher clash #11359 (issues: #11033, #11175)
• Die cwd die #10923 (issue: #10877)
• Remove cluster.routing.allocation.balance.primary #9159
• Add http.publish_port setting to the HTTP module #8807 (issue: #8137)
• Don’t accept a dynamic update to min_master_nodes which is larger then current master node count #8321
• Validates bool values in yaml for node settings #8186 (issue: #8097)
• Security: Disable CORS by default #7642 (issue: #7151)
• Store index creation time in index metadata #7218 (issue: #7119)
• Make cluster.routing.allocation.allow_rebalance a dynamic setting #7095 (issue: #7092)
• Security: Allow to configure CORS allow-credentials header to work via SSL #7059 (issue: #6380)
• Allow index.merge.scheduler.max_thread_count to be dynamically changed #6925 (issue: #6882)
• Security: Support regular expressions for CORS allow-origin to match against #6923 (issues: #5601, #6891)
• Added three frequency levels for resource watching #6896
• Added more utility methods to Settings #6840
• Improve Settings#get lookup for camel case support #6765
• Security: Make JSONP responses optional. #6164
• Allow to change concurrent merge scheduling setting dynamically #6098
• Trimmed the main elasticsearch.yml configuration file #5861
• Throw error when incorrect setting applied to auto_expand_replicas [ISSUE] #5752
• Add getAsRatio to Settings class, allow DiskThresholdDecider to take percentages #5690
• Corrected issue with throttle type setting not respected upon updates #5392
• Made possible to dynamically update discovery.zen.publish_timeout cluster setting #5068 (issue: #5063)

Shadow Replicas

• Implement retries for ShadowEngine creation #10688 (issue: #10637)
• Allow relocating primary shards on shared filesystems without failing the shard [ISSUE] #10469
• Allow primary promotion on shadow replica without failing the shard #9786

Snapshot/Restore

• Add support for bulk delete operation in snapshot repository #12587 (issue: #12533)
• Create a directory during repository verification #12323 (issue: #11611)
• Add validation of snapshot FileInfo during parsing #12108
• Add checksum to snapshot metadata files #12002 (issue: #11589)
• Snapshot info should contain version of elasticsearch that created the snapshot #11985 (issue: #11980)
• Extract all shard-level snapshot operation into dedicated SnapshotShardsService #11756
• Add snapshot name validation logic to all snapshot operations #11617
• Change metadata file format #11507
• Add support for applying setting filters when displaying repository settings #11270 (issue: #11265)
• Check that reading indices is allowed before creating their snapshots #11133
• Don’t throw an exception if repositories are unregistered with * #11113
• Improve the error message when attempting to snapshot a closed index #10608 (issue: #10579)
• AbstractBlobContainer.deleteByPrefix() should not list all blobs #10366 (issue: #10344)
• Batching of snapshot state updates #10295
• Expand wildcards in snapshot #9903 (issue: #6097)
• Refactor how restore cleans up files after snapshot was restored #9770
• Add ability to retrieve currently running snapshots #9400 (issues: #7859, #8782, #8887)
• Add support for changing index settings during restore process #9285 (issue: #7887)
• Override write(byte[] b, int off, int len) in FilterOutputStream for better performance #8749 (issue: #8748)
• Allow custom metadata to specify whether or not it should be in a snapshot #7901 (issue: #7900)
• Add repository validation #7680 (issue: #7096)
• Write Snapshots directly to the blobstore stream #7637
• It should be possible to restore an index without restoring its aliases [ISSUE] #6457
• Snapshot/Restore: Add ability to restore partial snapshots #6368 (issue: #5742)
• Switch to shared thread pool for all snapshot repositories #6182 (issue: #6181)
• Improve speed of running snapshot cancelation #5244 (issue: #5242)
• Add ability to get snapshot status for running snapshots #5123 (issue: #4946)
• Add throttling to snaphost and restore operations #4891 (issue: #4855)

Stats

• Refactor, remove _node/network and _node/stats/network. #12922 (issue: #12889)
• Expose ClassloadingMXBean in Node Stats #12764 (issue: #12738)
• Count scans in search stats and add metrics for scrolls #12069 (issue: #9109)
• Field stats: added index_constraint option #11259 (issue: #11187)
• Add CommitStats to supply information about the current commit point #10687
• Add throttle stats to index stats and recovery stats #10097
• Recovery: add total operations to the _recovery API #10042 (issue: #9368)
• Add pending tasks count to cluster health #9877
• Hot threads should include timestamp and params #9773
• Added verbose option to segments api, with full ram tree as first additional element per segment #9111
• Add ignore_idle_threads (default: true) to hot threads #8985 (issue: #8908)
• Add more fine grained memory stats from Lucene segment reader to index stats #8832
• Add time in index throttle to index stats. #7896 (issue: #7861)
• Add segments.index_writer_max_memory to stats #7440 (issues: #6483, #7438)
• Track the number of times the CircuitBreaker has been tripped #6134 (issue: #6130)
• Remove field names in stats url #6054 (issue: #5671)
• Add suggest stats #5563 (issue: #4032)
• Disable RAM usage estimation on Lucene 3.x segments. #5202 (issue: #5201)

Store

• Fall back to reading SegmentInfos from Store if reading from commit fails #11403 (issue: #11361)
• Consolidate directory lock obtain code #11390
• Read segment info from latest commit whenever possible #11361
• Move to one data.path per shard #10461 (issue: #9498)
• Schedule pending delete if index store delete fails #9856
• Improve safety when deleting files from the store #9801
• Add simple cache for StoreStats #9709 (issue: #9683)
• Use Directory#fileLength() less during calculating checksums #9689
• Cache fileLength for fully written files #9683
• Populate metadata.writtenBy for pre 1.3 index files. #9152
• Expose ShardId via LeafReader rather than Directory API #8812
• Synchronize operations that modify file mappings on DistributorDirectory #8408
• Drop pre 0.90 compression BWC #8385
• Use DistributorDirectory only if there are more than one data direcotry #8383
• Cut over MetaDataStateFormat to NIO Path API #8297
• Remove special file handling from DistributorDirectory #8276
• Try to increment store before searcher is acquired #7792
• Fold two hashFile implemenation into one #7720
• Before deleting shard verify that another node holds an active shard instance #6692
• Make a hybrid directory default using mmapfs / niofs #6636

Suggesters

• Remove filter from PhraseSuggester collate #11195
• Phrase Suggester Collate Enhancements #10710 (issue: #9377)
• Collate option in PhraseSuggester should allow returning phrases with no matching docs #6929 (issue: #6927)
• Speed up phrase suggestion scoring #5396 (issue: #5395)

Term Vectors

• Only load term statistics if required #11737
• Requests are now timed #9583
• Support for shard level caching of term vectors #8395
• Add support for distributed frequencies #8144
• Add support for realtime term vectors #7846
• Support for custom analyzers in term vectors and MLT query #7801
• Support for artificial documents #7530
• Support for version and version_type #7480
• Return found: false for docs requested between index and refresh #7124 (issue: #7121)
• Adds support for wildcards in selected fields #7061
• Compute term vectors on the fly if not stored in index #6567 (issue: #5184)

Top Hits

• In top_hits agg, when parent doc is found stop iterating over segments and continue with the next top matching child doc #6895 (issue: #1843)
• Added pagination support to top_hits aggregation by adding from option #6312 (issue: #6299)

Translog

• Make translog file name parsing strict #11875
• Some smallish translog cleanups #11200
• Add translog checkpoints to prevent translog corruption #11143 (issues: #10933, #11011)
• Make modifying operations durable by default. #11011 (issue: #10933)
• Use buffered translog type also when sync is set to 0 #10993
• Remove useless random translog directory selection #10589
• Handle truncated translog gracefully #9797 (issue: #9699)
• Don’t rename recovery translog in gateway #9719
• Cut over to Path API #8611
• Refactor the Translog.read(Location) method #7780
• Write translog opSize twice #7735
• Remove unused stream #7683
• Clean up translog interface #7564
• Add translog checksums #7232 (issue: #6554)
• Set default translog flush_threshold_ops to unlimited, to flush by byte size by default and not penalize tiny documents #6783 (issue: #6443)
• Use unlimited flush_threshold_ops for translog (again) [ISSUE] #6726
• Raise proper failure if not fully reading translog entry #6562
• Use unlimited flush_threshold_ops for translog #5900
• Fix visibility in buffered translog #5609
• Use BytesReference to write to translog files #5463
• Don’t throttle the translog stage of recovery [ISSUE] #4890

Tribe Node

• Index level blocks, index conflict settings #5501

Upgrade API

• Refactor upgrade API to use transport and write minimum compatible version that the index was upgraded to #11333 (issues: #11072, #11095)
• Add upgrade_only_ancient_segments option to upgrade API #10540 (issue: #10213)
• Remove ability to run optimize and upgrade async #9640 (issue: #9638)

Bug fixesedit

Aggregations

• Aggregation: Fix AggregationPath.subPath() to not throw ArrayStoreException #13035
• Throw error if cardinality aggregator has sub aggregations #12989 (issue: #12988)
• Full path validation for pipeline aggregations #12595 (issue: #12360)
• Upgrade HDRHistogram to version 2.1.6. #12554
• Fixes serialization of HDRHistogram in percentiles aggregations #12505
• Fix cidr mask conversion issue for 0.0.0.0/0 and add tests #12005 #12430 (issue: #12005)
• Adds new script API to ValuesSourceMetricsAggregationBuilder #12152
• Aggregations: Makes SKIP Gap Policy work correctly for Bucket Script aggregation #11970
• moving_avg forecasts should not include current point #11641
• Allow aggregations_binary to build and parse #11473 (issue: #11457)
• Fix bug where moving_avg prediction keys are appended to previous prediction #11465 (issue: #11454)
• Sibling Pipeline Aggregations can now be nested in SingleBucketAggregations #11380 (issue: #11379)
• Fixed Moving Average prediction to calculate the correct keys #11375 (issue: #11369)
• Queries with size:0 break aggregations that need scores #11358 (issue: #11119)
• Fix geo bounds aggregation when longitude is 0 #11090 (issue: #11085)
• Fixes Infinite values return from geo_bounds with non-zero bucket-ordinals #10917 (issue: #10804)
• Sampler agg could not be used with Terms agg’s order. #10785 (issue: #10719)
• Fix _as_string output to only show when format specified #10571 (issue: #10284)
• Fix multi-level breadth-first aggregations. #10411 (issues: #9544, #9823)
• Be lenient when converting local to utc time in time zone roundings #10031 (issue: #10025)
• Prevent negative intervals in date_histogram #9690 (issue: #9634)
• Make the nested aggregation call sub aggregators with doc IDs in order #9548 (issue: #9547)
• Remove limitation on field access within aggs to the types provided in the search #9487
• Validate the aggregation order on unmapped terms in terms agg. #8952 (issue: #8946)
• Fix date_histogram issues during a timezone DST switch #8655 (issue: #8339)
• Fix geohash grid doc counts computation on multi-valued fields #8574 (issue: #8512)
• Parser throws NullPointerException when Filter aggregation clause is empty #8527 (issue: #8438)
• Fixes scripted metrics aggregation when used as a sub aggregation #8037 (issue: #8036)
• Makes script params consistent with other APIs in scripted_metric #7969
• Significant terms can throw error on index with deleted docs. #7960 (issue: #7951)
• Fixes resize bug in Geo bounds Aggregator #7565 (issue: #7556)
• The nested aggregator should iterate over the child doc ids in ascending order. #7514 (issue: #7505)
• Fixes pre and post offset serialisation for histogram aggs #7313 (issue: #7312)
• key_as_string only shown when format specified in terms agg #7160 (issue: #7125)
• Fixed value count so it can be used in terms order #7051 (issue: #7050)
• Fix infinite loop in the histogram reduce logic. #7022 (issue: #6965)
• More lenient type parsing in histo/cardinality aggs #6948 (issue: #6893)
• Fixed Histogram key_as_string bug #6830 (issue: #6655)
• Fix JSON response for significant terms #6535
• Fix reducing of range aggregations. #6484 (issue: #6435)
• Fix cardinality aggregation when doc values field is empty #6413
• Fixed conversion of date field values when using multiple date formats #6266 (issue: #6239)
• Fail queries that have two aggregations with the same name. #6258 (issue: #6255)
• Aggregations parsing is too lenient. #5837 (issue: #5827)
• Fix DateHistogramBuilder to use a String pre_offset and post_offset #5587 (issue: #5586)
• DateHistogram.Bucket should return the date key in UTC [ISSUE] #5477
• Fix cardinality memory-usage considerations. #5452
• Allow scripts to return more than 4 values in aggregations. #5416 (issue: #5414)
• Invoke postCollection on aggregation collectors #5387
• Fixed a bug in date_histogram aggregation parsing #5379 (issue: #5375)
• Fix NPE/AIOOBE when building a bucket which has not been collected. #5250 (issue: #5048)
• Changing the sorting for terms aggs, #5237 (issue: #5236)
• Changed the caching of FieldDataSource in aggs to be based on field name… #5205 (issue: #5190)
• date_histogram against empty index results in ArrayIndexOutOfBoundsException [ISSUE] #5179
• Fix BytesRef owning issue in string terms aggregations. #5039 (issue: #5021)
• Fix hashCode values of aggregations' BytesValues. #5006 (issue: #5004)
• Sorting terms agg by sub-aggegation doesn’t respect asc/desc when executing on a single shard [ISSUE] #4951
• Fixed an issue where there are sub aggregations executing on a single shard #4869 (issue: #4843)

Aliases

• Take into account _default_ mapping in index template when parsing alias filter in index templates. #8577 (issue: #8473)
• PUT /_aliases should accept a numeric routing value #5471 (issue: #5465)

Allocation

• Fix messaging about delayed allocation #12515 (issue: #12456)
• ThrottlingAllocationDecider should not counting relocating shards #12409
• Shard Started messages should be matched using an exact match #11999
• Reroute after node join is processed #11960 (issues: #11776, #11923)
• GatewayAllocator: reset rerouting flag after error #11519 (issue: #11421)
• Weight deltas must be absolute deltas #9149 (issue: #9023)
• Fix handling of dangling_timeout set to 0 and auto_import_dangled true #8257
• Enable ClusterInfoService by default #8206
• Improve handling of failed primary replica handling #6816 (issue: #6808)
• Do not ignore ConnectTransportException for shard replication operations #6813
• Failed shards could be re-assigned to the same nodes if multiple replicas failed at once #5725
• BalancedShardAllocator makes non-deterministic rebalance decisions [ISSUE] #4867

Analysis

• Custom analyzer names and aliases must not start with _ #11303 (issue: #9596)
• Fix tokenizer settings in SynonymTokenFilterFactory #10489
• CharArraySet doesn’t know how to lookup the original string in an ImmutableList. #6238 (issue: #6237)
• Analyze API: Default analyzer accidentally removed stopwords #6043 (issue: #5974)

Bulk

• Fix: Use correct OpType on Failure in BulkItemResponse #12060 (issue: #9821)
• Allow null values in the bulk action/metadata line parameters #11459 (issue: #11458)
• Throw exception if unrecognized parameter in bulk action/metadata line #11331 (issue: #10977)
• _default_ mapping should be picked up from index template during auto create index from bulk API #10762 (issue: #10609)
• Removed duplicate timeout param #10205
• Handle failed request when auto create index is disabled #8163 (issue: #8125)
• Bulk operation can create duplicates on primary relocation #7729
• Cluster block with auto create index bulk action can cause bulk execution to not return #7109 (issue: #7086)
• Do not fail whole request on closed index #6790 (issue: #6410)
• Fix return of wrong request type on failed updates #6646 (issue: #6630)
• Bulk request which try and fail to create multiple indices may never return #6436
• Fix mapping creation on bulk request #5623
• Ensure that index specific failures do not affect whole request #4995 (issue: #4987)
• Failed preparsing does not fail whole bulk request #4781 (issue: #4745)

CAT API

• _cat/nodes: Thread null handling through stats and info #9938 (issue: #6297)
• Fix NullPointerException in cat-recovery API #6190
• _cat/allocation returns -1 as disk.total for clients nodes [ISSUE] #5948
• ElasticsearchIllegalStateException when invoking _cat plugins [ISSUE] #5715
• Node version sometimes empty in _cat/nodes [ISSUE] #5480

CRUD

• detect_noop now understands null as a valid value #11210 (issue: #11208)
• The parent option on update request should be used for upsert only. #9612 (issue: #4538)
• Don’t throw DAEE on replica for create operation; use IW.updateDocument/s instead #7146 (issue: #7142)
• MultiGet: Fail when using no routing on an alias to an index that requires routing #7145
• Add parameter to GET API for checking if generated fields can be retrieved #6973 (issue: #6676)
• DocumentMissingException is also thrown on update retries #6724 (issue: #6355)

Cache

• Store filter cache statistics at the shard level instead of index. #11886
• Don’t use bitset cache for children filters. #10663 (issues: #10629, #10662)
• Remove query-cache serialization optimization. #9500 (issue: #9294)
• Queries are never cached when date math expressions are used (including exact dates) #9269 (issue: #9225)
• Change default eager loading behaviour for nested fields and parent/child in bitset cache #8440
• Don’t eagerly load NestedDocsFilter in bitset filter cache, because it is never used. #8414 (issue: #8394)
• Fixed bitset filter cache leftover in nested filter #8303
• Cleanup non nested filter to not flip the FixedBitSet returned by the wrapped filter. #8232 (issue: #8227)
• Move the child filter over to the fixed bitset cache. #8171

Circuit Breakers

• Make "noop" request breaker a non-dynamic setting #8179
• Only set breaker when stats are retrieved #7721
• Disable circuit breaking for BigArrays #6381 (issue: #6332)
• Percolator doesn’t reduce CircuitBreaker stats in every case. #5588
• Fix possible discrepancy in circuit breaker in parent/child #5526
• Fix issue where circuit breaker was always reset to 80% upon startup #5334
• NullPointerException in RamAccounntingTermsEnum [ISSUE] #5326

Cluster

• Changes in unassigned info and version might not be transferred as part of cluster state diffs #12387
• Rename cluster state uuid to updateId #11862 (issue: #11831)
• ClusterHealth shouldn’t fail with "unexpected failure" if master steps down while waiting for events #11493
• Write state also on data nodes if not master eligible #9952 (issue: #8823)
• GatewayService should register cluster state listener before checking for current state #8789
• Extend refresh-mapping logic to the _default_ type #8413 (issue: #4760)
• ClusterHealthAPI does not respect waitForEvents when local flag is set #7731
• Use node’s cluster name as a default for an incoming cluster state who misses it #7414 (issue: #7386)
• Use the provided cluster state instead of fetching a new cluster state from cluster service. #7013
• During recovery, only send mapping updates to master if needed #6772 (issue: #6762)
• Check for index blocks against concrete indices on master operations [ISSUE] #6694
• Also send Refresh and Flush actions to relocation targets #6545
• Do not execute cluster state changes if current node is no longer master #6230
• Add cluster name to state #5624 (issue: #5622)
• TransportMasterNodeOperationAction: tighter check for postAdded cluster state change #5548 (issue: #5499)

Core

• Remove Settings.getAsClass #12744 (issues: #12643, #12656)
• ThreadPools: schedule a timeout check after adding command to queue #12319
• Throw LockObtainFailedException exception when we can’t lock index directory #12203
• Only clear open search ctx if the index is delete or closed via API #12199 (issue: #12116)
• Close lock even if we fail to obtain #11412
• Balance new shard allocations more evenly on multiple path.data #11185 (issue: #11122)
• Use System.nanoTime for elapsed time #11058
• Increase default rate limiting for snapshot, restore and recovery to 40 MB/sec #10185 (issue: #6018)
• Also throttle delete by query when merges fall behind #9986
• Promptly cleanup updateTask timeout handler #9621
• Disable auto gen id optimization #9468 (issue: #8788)
• Verify the index state of concrete indices after alias resolution #9057
• ignore_unavailable shouldn’t ignore closed indices #9047 (issue: #7153)
• Hard wire utf-8 encoding, so unicode filenames work #8847
• Remove unnecessary index removal on index creation #8639
• Remove _state directory if index has been deleted #8610
• Disable bloom filters #8572 (issues: #8564, #8571)
• Return 0 instead of -1 for unknown/non-exposed ramBytesUsed() #8291 (issue: #8239)
• Don’t catch FNF/NSF exception when reading metadata #8207
• Don’t handle FNF exceptions when reading snapshot #8086
• Upgrade to Jackson Smile 2.4.1.1 #7327 (issue: #18)
• Force refresh when versionMap is using too much RAM #6443 (issue: #6378)
• Use XNativeFSLockFactory instead of the buggy Lucene 4.8.1 version [ISSUE] #6424
• Restore shard routing. #6393 (issues: #5562, #6391)
• Don’t report terms as live if all it’s docs are filtered out #6221 (issue: #6211)
• Ensure pending merges are updated on segment flushes #5780 (issue: #5779)

Dates

• Add millisecond parser for dynamic date fields mapped from "yyyy/MM/dd" #12977 (issue: #12873)
• Query string time zone not working #10883 (issue: #10477)
• DateMath: Use time zone when rounding. #9885 (issue: #9814)
• Resolve now in date ranges in percolator and alias filters at search time instead of parse time #8534 (issue: #8474)

Discovery

• Make sure NodeJoinController.ElectionCallback is always called from the update cluster state thread #12372
• ZenDiscovery: #11960 failed to remove eager reroute from node join #12019
• Node receiving a cluster state with a wrong master node should reject and throw an error #9963
• Check index uuid when merging incoming cluster state into the local one #9541 (issue: #9489)
• Only retry join when other node is not (yet) a master #8972
• Removed unnecessary DiscoveryService reference from LocalDiscovery #8415 (issue: #8539)
• Improve the lifecycle management of the join control thread in zen discovery. #8327
• UnicastZenPing - use temporary node ids if can’t resolve node by it’s address #7719
• Transport client: Don’t add listed nodes to connected nodes list in sniff mode #7067 (issues: #6811, #6829, #6894)
• Handle ConnectionTransportException during a Master/Node fault detection ping during Discovery #6686

Engine

• Fix NPE when streaming commit stats #11266
• Sync translog before closing engine #10484
• Fixes InternalIndexShard callback handling of failure #8644 (issue: #5945)
• Add current translog ID to commit meta before closing #8245
• The index.fail_on_corruption setting is not updateable #6941
• Closing an IndexReader on an already relocated / closed shard can cause memory leaks [ISSUE] #5825

Exceptions

• Use StartupError to format all exceptions hitting the console #13041 (issue: #13040)
• Improve console logging on startup exception #12976
• Don’t special-case on ElasticsearchWrapperException in toXContent #12015 (issue: #11994)
• Implement toXContent on ShardOpertionFailureException #11155 (issue: #11017)
• Remove double exception handling that causes false replica failures #10990
• Fixing copy/paste mistake in SearchRequest.extraSource’s exception message #8118 (issue: #8117)
• Turn unexpected exceptions when reading segments into CorruptedIndexException #7693
• Throw better error if invalid scroll id is used #5738 (issue: #5730)

Fielddata

• Reclaim memory from fielddata synchronously when an explicit clear is performed. #11697 (issue: #11695)
• Load fielddata on behalf of scripts. #10997
• Fix iterator over global ordinals. #8627 (issue: #8580)
• Fix FieldDataWeighter generics to accept RamUsage instead of AtomicFieldData #6262 (issue: #6260)
• Eager fielddata loading not working #5557

Geo

• Correct ShapeBuilder coordinate parser to ignore values in 3rd+ dimension #10539 (issue: #10510)
• Fix hole intersection at tangential coordinate #10332 (issue: #9511)
• Fix validate_* merge policy for GeoPointFieldMapper #10165 (issue: #10164)
• Correct bounding box logic for GeometryCollection type #9550 (issue: #9360)
• Throw helpful exception for Polygons with holes outside of shell #9105 (issue: #9071)
• GIS envelope validation #9091 (issues: #2544, #8672, #9067, #9079, #9080)
• Fix for NPE enclosed in SearchParseException for a "geo_shape" filter or query #8785 (issue: #8432)
• Fix for geohash neighbors when geohash length is even. #8529 (issue: #8526)
• Fix geohash grid aggregation on multi-valued fields. #8513 (issue: #8507)
• Fix for ArithmeticException[/ by zero] when parsing a polygon #8475 (issue: #8433)
• Remove unnecessary code from geo distance builder #8338
• Fix IndexedGeoBoundingBoxFilter to not modify the bits of other filters. #8325
• Fix circle radius calculation #7338 (issue: #7301)
• Improved error handling in geo_distance #7272 (issue: #7260)
• Fixes computation of geohash neighbours #7247 (issue: #7226)
• Better error for invalid multipolygon #7190 (issue: #7126)
• Fix geo_shapes which intersect dateline #7188 (issue: #7016)
• Fixes parse error with complex shapes #6976 (issue: #5773)
• Issue with polygons near date line #6282 (issue: #6179)
• optimize_bbox for geo_distance filters can cause missing results [ISSUE] #6008
• Add exceptions to GeoPointFieldMapper #5403 (issue: #5390)

Highlighting

• Plain highlighter to use analyzer defined on a document level #6267 (issue: #5497)
• Implement BlendedTermQuery#extractTerms to support highlighing. #5247 (issue: #5246)
• Made SearchContextHighlight.Field class immutable to prevent from unwanted updates #5223 (issue: #5175)
• Highlighting on a wildcard field name causes the wildcard expression to be returned rather than the actual field name [ISSUE] #5221
• Fixed multi term queries support in postings highlighter for non top-level queries #5143 (issues: #4052, #5127)

Index APIs

• Remove expansion of empty index arguments in RoutingTable #10148 (issue: #9081)
• Fix to make GET Index API consistent with docs #9178 (issue: #9148)
• Upsert does not use ttl value #8715 (issue: #3256)
• Fix GET index API always running all features #8392
• Fix optimize behavior with force and flush flags. #7920 (issues: #7886, #7904)
• Fixed validate query parsing issues #6114 (issues: #6111, #6112, #6116)

Indexed Scripts/Templates

• Fix updating templates. #10526 (issue: #10397)
• ScriptService can deadlock entire nodes if script index is recovering #8901
• GetIndexedScript call can deadlock #8266
• Make template params take arrays #8255
• Cleaned up various issues #7787 (issues: #7559, #7560, #7567, #7568, #7647)
• Change the default auto_expand for the .scripts index to 0-all #7502
• Fix .script index template. #7500

Inner Hits

• Reset the ShardTargetType after serializing inner hits. #12261
• Properly support named queries for both nested and parent child inner hits #11880 (issues: #10661, #10694)
• Fix multi level parent/child bug #11199
• Make sure size=0 works on the inner_hits level. #10388 (issue: #10358)
• Make sure inner hits also works for nested fields defined in object field #10353 (issue: #10334)
• Fix bug where parse error is thrown if a inner filter is used in a nested filter/query. #10309 (issue: #10308)
• Fix nested stored field support. #10235 (issue: #9766)
• Don’t fail if an object is specified as a nested value instead of an array. #9743 (issue: #9723)
• Make sure inner hits defined on has_parent query resolve hits properly #9384

Internal

• Add plugin modules before (almost all) others #13061 (issue: #12783)
• Workaround JDK bug 8034057 #12970
• Fix concurrency issue in PrioritizedEsThreadPoolExecutor. #12599
• Fix ShardUtils#getElasticsearchDirectoryReader() #12594
• don’t represent site plugins with null anymore #12577
• IndicesStore shouldn’t try to delete index after deleting a shard #12494 (issue: #12487)
• ShardUtils#getElasticsearchLeafReader() should use FilterLeafReader#getDelegate() instead of FilterLeafReader#unwrap #12437
• Fix serialization of IndexFormatTooNewException and IndexFormatTooOldException #12277
• Decode URL.getPath before resolving a real file #11940
• Fix FieldDataTermsFilter.equals. #11835 (issue: #11779)
• Add a null-check for XContentBuilder#field for BigDecimals #11790 (issue: #11699)
• AsyncShardFetch can hang if there are new nodes in cluster state #11615
• Make JNA optional for tests and move classes to bootstrap package #11378 (issue: #11360)
• Transport: remove support for reading/writing list of strings, use arrays instead #11276 (issue: #11056)
• Fix CompressedString.equals. #11233
• ThreadPool: make sure no leaking threads are left behind in case of initialization failure #11061 (issue: #9107)
• Propagate headers & contexts to sub-requests #11060 (issue: #10979)
• Fix NPE in PendingDelete#toString #11032
• Ensure that explanation descriptions are not null on serialization #10689 (issue: #10399)
• Fix possible NPE in InternalClusterService$NotifyTimeout, the future field is set from a different thread #10630 (issue: #3)
• Allow ActionListener to be called on the network thread #10573 (issue: #10402)
• Add missing hashCode method to RecoveryState#File #10501
• Don’t try to send a mapping refresh if there is no master #10311 (issue: #10283)
• Fix PageCacheRecycler’s max page size computation. #10087 (issue: #10077)
• Close all resources if doStart fails #9898
• Snapshot status api: make sure headers are handed over to inner nodes request #9409
• Fix equality check of timevalue after serialization #9218
• AdapterActionFuture should not set currentThread().interrupt() #9141 (issue: #9001)
• PlainTransportFuture should not set currentThread().interrupt() #9001
• IndexService - synchronize close to prevent race condition with shard creation #8557
• When corruption strikes, don’t create exceptions with circular references #8331
• In fixed bitset service fix order where the warmer listener is added. #8168 (issue: #8140)
• Only schedule another refresh if refresh_interval is positive #8087 (issue: #8085)
• Fix serialization of PendingClusterTask.timeInQueue. #8077
• Dangling indices import ignores aliases #8059
• Fix serialization of short[] arays. #8025 (issue: #7845)
• Make close() synchronized during node shutdown #7885
• Ensure GroupShardsIterator is consistent across requests, to ensure consistent sorting #7698
• Fix ordering of Regex.simpleMatch() parameters #7661 (issue: #7651)
• Unify search context cleanup #7643 (issue: #7625)
• Use SEARCH threadpool for potentially blocking operations #7624 (issue: #7623)
• Make network interface iteration order consistent #7494
• Add all unsafe variants of LZF compress library functions to forbidden APIs. #7468 (issue: #8078)
• Wait until engine is started up when acquiring searcher #7456 (issue: #7455)
• Fix discovery.id.seed #7439 (issue: #7437)
• Made original indices optional for broadcast delete and delete by query shard requests #7406
• Force optimize was not passed to shard request #7405 (issue: #7404)
• Fixed a request headers bug in transport client #7302
• Fix explanation streaming #7257
• VerboseProgress(PrintWriter) does not set the writer #7254
• Fix a very rare case of corruption in compression used for internal cluster communication. #7210
• Fix BytesStreamInput(BytesReference) ctor with nonzero offset #7197
• Fix serialization bug in reroute API #7135
• Support parsing lucene minor version strings #7055
• Fix connect concurrency, can cause connection nodes to close #6964
• Drop UnsafeUtils #6963 (issue: #6962)
• When serializing HttpInfo, return null info if service is not started #6906
• Remove indicesLifecycle.Listener from IndexingMemoryController #6892
• Fix possible NPE during shutdown for requests using timeouts #6849
• Prevent NPE if engine is closed while version map is checked #6786
• If the node initialisation fails, make sure the node environment is closed correctly #6715
• IndexingMemoryController should only update buffer settings of fully recovered shards #6667 (issue: #6642)
• Fix possible race condition in checksum name generator #6662
• Allow to serialize negative thread pool sizes #6486 (issues: #5357, #6325)
• The ignore_unavailable option should also ignore indices that are closed #6475 (issue: #6471)
• Guava doesn’t explicitly remove entries when clearing the entire cache [ISSUE] #6296
• MetaData#concreteIndices to throw exception with a single index argument if allowNoIndices == false #6137
• Restore read/write visibility in PlainShardsIterator. #6039 (issue: #5561)
• Use TransportBulkAction for internal request from IndicesTTLService #5795 (issue: #5766)
• Take stream position into account when calculating remaining length #5677 (issue: #5667)
• Fix some warnings reported by Findbugs. #5571
• Assorted fixes for bugs in the PagedBytesReference tests #5549
• Fix for zero-sized content throwing off toChannelBuffer(). #5543
• Count latch down if sendsPing throws exception #5440
• Fix yamlBuilder() to return YAML builder instead of SMILE #5186 (issue: #5185)

Java API

• Add missing support for escape to QueryStringQueryBuilder #13016
• Fix PrefixQueryBuilder to support an Object value #12124 (issue: #12032)
• Properly fix the default regex flag to ALL for RegexpQueryParser and Builder #12067 (issue: #11896)
• Java api: add missing support for boost to GeoShapeQueryBuilder and TermsQueryBuilder #11810 (issue: #11744)
• Add missing rewrite parameter to FuzzyQueryBuilder #11139 (issue: #11130)
• Ensure netty I/O thread is not blocked in TransportClient #10644
• toString for SearchRequestBuilder and CountRequestBuilder #9944 (issues: #5555, #5576)
• Added missing module registration in TransportClient for Significant Terms #7852 (issue: #7840)
• Get indexed script shouldn’t allow to set the index [ISSUE] #7553
• Add back string op type to IndexRequest #7387
• Fixed the node retry mechanism which could fail without trying all the connected nodes #6829
• Fix source excludes setting if no includes were provided [ISSUE] #6632
• BulkRequest#add(Iterable) to support UpdateRequests #6551
• Make sure afterBulk is always called in BulkProcessor #6495 (issue: #5038)
• JsonXContentGenerator#writeRawField produces invalid JSON if raw field is the first field in the json object [ISSUE] #5514
• Fix returning incorrect XContentParser #5510
• Enforce query instance checking before it wrapper as a filter #5431
• forceSource highlighting field option doesn’t have any effect when set using the Java API [ISSUE] #5220
• BulkProcessor process every n+1 docs instead of n #4265

Logging

• Use task’s class name if not a TimedPrioritizeRunnable #11610
• Fix potential NPE in new tracer log if request timeout #9994 (issue: #9286)
• Fix example in logging daily rotate configuration #8550 (issue: #8464)
• Fix location information for loggers #8052 (issue: #5130)
• Fixes Logger class for BackgroundIndexer #6781
• Fix format string for DiskThresholdDecider reroute explanation #5749

Mapping

• Move the murmur3 field to a plugin and fix defaults. #12931 (issue: #12874)
• Fix field type compatiblity check to work when only one previous type exists #12779 (issue: #12753)
• numeric_resolution should only apply to dates provided as numbers. #11002 (issue: #10995)
• Wait for mappings to be available on the primary before indexing. #10949
• Fix _field_names to not have doc values #10893 (issue: #10892)
• Explicitly disallow multi fields from using object or nested fields #10745
• Unneccesary mapping refreshes caused by unordered fielddata settings #10370 (issue: #10318)
• Fixed an equality check in StringFieldMapper. #10359 (issue: #10357)
• Fix doc values representation to always serliaze if explicitly set #10302 (issue: #10297)
• Fix _field_names to be disabled on pre 1.3.0 indexes #10268 (issue: #9893)
• Fix ignore_malformed behaviour for ip fields #10112
• Update dynamic fields in mapping on master even if parsing fails for the rest of the doc #9874 (issue: #9851)
• Throw StrictDynamicMappingException exception if dynamic:strict and undeclared field value is null #9445 (issue: #9444)
• Using default:null for _timestamp field creates a index loss on restart #9233 (issues: #9104, #9223)
• Reencode transformed result with same xcontent #8974 (issue: #8959)
• Serialize doc values settings for _timestamp #8967 (issue: #8893)
• Update cluster state with type mapping also for failed indexing request #8692 (issue: #8650)
• Fix conflict when updating mapping with _all disabled #8426 (issues: #7377, #8423)
• Generate dynamic mappings for empty strings. #8329 (issue: #8198)
• Throw exception if null_value is set to null #7978 (issue: #7273)
• Posting a mapping with default analyzer fails #7902 (issue: #2716)
• Add explicit error when PUT mapping API is given an empty request body. #7618 (issue: #7536)
• Enable merging of properties in the _timestamp field #7614 (issues: #5772, #6958, #777)
• Fix index setting in _boost field #7557
• Keep parameters in mapping for _timestamp and _size even if disabled #7475
• Report conflict when trying to disable _ttl #7316 (issues: #7293, #777)
• Make sure that multi fields are serialized in a consistent order. #7220 (issue: #7215)
• Fix dynamic mapping of geo_point fields #7175 (issue: #6939)
• Improve IP address validation #7141 (issue: #7131)
• Fix copy_to behavior on nested documents. #7079 (issue: #6701)
• Add multi_field support for Mapper externalValue (plugins) #6867 (issue: #5402)
• Fix possibility of losing meta configuration on field mapping update #6550 (issue: #5053)
• Allow _version to use disk as a doc values format. #6523
• Path-based routing doesn’t work with doc values [ISSUE] #5844
• geo_point doesn’t allow null values as of 1.1.0 [ISSUE] #5680
• Check "store" parameter for binary mapper and check "index_name" for all mappers #5585 (issue: #5474)
• Fix dynamic_type in dynamic_template #5564 (issue: #5256)
• Fix include_in_all for multi field #5522 (issue: #5364)
• merge GeoPoint specific mapping properties #5506 (issue: #5505)
• Merge null_value for boolean field and remove include_in_all for boolean field in doc #5503 (issue: #5502)
• Geo Point Fieldmapper: Allow distance for geohash precision #5449 (issue: #5448)
• Make sure get field mapping request is executed on node hosting the index #5225 (issue: #5177)
• Added fields support to geo_point and completion field type #4963

More Like This

• Fix potentially unpositioned enum [ISSUE] #12066
• Fix exclude with artificial documents #8679
• Fixes many misbehaving user parameters #8028 (issue: #2914)
• Fix percent_terms_to_match #7754
• Remove unused search_query_hint parameter #7691
• More Like This API would not take into account size and from in request body #5981

NOT CLASSIFIED

• Rivers might not get started due to missing _meta document [ISSUE] #4864

Nested Docs

• Nested agg needs to reset root doc between segments. #9441 (issues: #9436, #9437)
• Fix handling of multiple buckets being emitted for the same parent doc id in nested aggregation #9346 (issues: #8454, #9317)
• In reverse nested aggregation, fix handling of the same child doc id being processed multiple times. #9345 (issues: #9263, #9346)
• The parent filter of the nested aggregator isn’t resolved correctly all the time #9335 (issue: #9280)
• Change nested agg to execute in doc id order #8454
• If the _type field isn’t indexed nested inner docs must be filtered out. #7410
• The nested aggregator should also resolve and use the parentFilter of the closest reverse_nested aggregator. #7048 (issue: #6994)
• Allow sorting on nested sub generated field #6151 (issue: #6150)
• A nested nested aggregation falls outside of its parent nested aggregation bounds #5728

Network

• Deduplicate addresses from resolver. #12995
• Remove usage of InetAddress#getLocalHost #12959
• Fix network binding for ipv4/ipv6 #12942 (issues: #12906, #12915)
• Transport: Do not make the buffer skip while a stream is open. #11988
• Transport: fix racing condition in timeout handling #10220 (issue: #10187)
• Netty: Add HTTP pipelining support #8299 (issue: #2665)
• Fix NPE when initializing an accepted socket in NettyTransport. #6144

Packaging

• Fix variable substitution for OS’s using systemd #12909
• Fix rpm -e removing /etc/elasticsearch #12785
• Makes sure all POMs contain a description #12771 (issue: #12550)
• use spaces liberally in integration tests and fix space handling #12710 (issue: #12709)
• rpm and deb create scripts directory #12704 (issue: #12702)
• Fix shaded jar packaging #12589
• Fix Bootstrap to not call System.exit #12586
• elasticsearch (again) adds CWD to classpath [ISSUE] #12580
• jsr166e was left out of shaded jar #12194 (issue: #12193)
• Don’t add CWD to classpath when ES_CLASSPATH isn’t set. #12001 (issue: #12000)
• Fix endless looping if starting fails #11836
• Postrm script should not fail #11678 (issue: #11373)
• Create PID_DIR in init.d script #11674 (issue: #11594)
• Fix missing dependencies for RPM/DEB packages #11664 (issue: #11522)
• Update project.name in bin/elasticsearch script #11348
• Add antlr and asm dependencies #9696
• Added quotes to allow spaces in installation path #8428 (issue: #8441)
• Move forbidden api signature files to dev-tools. #7921 (issue: #7917)
• Parsing command line args multiple times throws AlreadySelectedException #7282
• Don’t remove ancestors on deb removal #7078 (issue: #5770)
• Shade mustache into org.elasticsearch.common package #6193 (issue: #6192)
• Export JAVA_HOME in RPM init script #5434
• Set permission in debian postinst script correctly #5158 (issue: #3820)
• RPMs: Add timeout to shutdown with KILL signal #4721 (issue: #5020)

Parent/Child

• Explicitly disabled the query cache #12955
• Fix _parent.type validation #11436
• Fix 2 bugs in children agg #10263 (issues: #10158, #9544, #9958)
• Post collection the children agg should also invoke that phase on its wrapped child aggs. #9291 (issue: #9271)
• Fix concurrency issues of the _parent field data. #9030 (issue: #8396)
• Fixed p/c filters not being able to be used in alias filters. #8649 (issues: #5916, #8628)
• Missing parent routing causes NullPointerException in Bulk API #8506 (issue: #8365)
• The children agg didn’t take deleted document into account #8180
• Check if there is a search context, otherwise throw a query parse exception. #8177 (issue: #8031)
• has_parent filter must take parent filter into account when executing the inner query/filter #8020 (issue: #7362)
• A has_child or other p/c query wrapped in a query filter may emit wrong results #7685
• Add support for the field data loading option to the _parent field. #7402 (issue: #7394)
• If _parent field points to a non existing parent type, then skip the has_parent query/filter #7362 (issue: #7349)
• Disabled parent/child queries in the delete by query api. #5916 (issue: #5828)
• Parse has_child query/filter after child type has been parsed #5838 (issue: #5783)
• Parent / child queries should work with non-default similarities #4979 (issue: #4977)

Percolator

• Support filtering percolator queries by date using now #12215 (issue: #12185)
• Fix NPE when percolating a document that has a _parent field configured in its mapping #12214 (issue: #12192)
• Load percolator queries before shard is marked POST_RECOVERY #11799 (issue: #10722)
• Fail nicely if nested query with inner_hits is used in a percolator query #11793 (issue: #11672)
• Prevent PercolateResponse from serializing negative VLong #11138
• Fix wrong use of currentFieldName outside of a parsing loop #10307
• Support encoded body as query string param consistently #9628
• Take filters from aliases into account #9590 (issue: #6241)
• Fixed bug when using multi percolate api with routing #9161 (issue: #6214)
• Pass down the types from the delete mapping request to the delete by query request #7091 (issue: #7087)
• Fix memory leak when percolating with nested documents #6578
• Fix handling of nested documents #6544 (issue: #6540)
• Percolator: Fix assertion in percolation with nested docs #6263
• Add num_of_shards statistic to percolate context #6123 (issue: #6037)
• The percolator needs to take deleted percolator documents into account. #5843 (issue: #5840)
• Propagate percolate mapping changes to cluster state #5776
• Fix highlighting in percolate existing doc api #5108
• Make highlight query also work in the percolate api #5090
• Percolator response always returns the matches key. #4882 (issue: #4881)

Plugin Cloud Azure

• Correctly list blobs in Azure Storage to prevent snapshot corruption and do not unnecessarily duplicate Lucene segments in Azure Storage #12380 (issues: #51, #99)

Plugin Delete By Query

• Fix number of deleted/missing documents in Delete-By-Query #11745

Plugins

• Fix automatically generated URLs for official plugins in PluginManager #12885
• Skip hidden files #12465 (issue: #12433)
• strip elasticsearch- and es- from any plugin name #12160 (issues: #12143, #12158)
• remove elasticsearch- from name of official plugins #12158 (issues: #11805, #12143)
• Fix pluginmanager permissions for bin/ scripts #12157 (issue: #12142)
• Only load a plugin once from the classpath #11301
• Let HTTPS work correctly #10983
• HTTP: Ensure url path expansion only works inside of plugins #10815
• Installation failed when directories are on different file systems #9011 (issue: #8999)
• NPE when plugins dir is inaccessible #8839 (issue: #8837)
• Plugins failed to load since #8666 #8756
• Support usage of ES_JAVA_OPTS in plugin commands #8288
• Fix config path extraction from plugin handle #7935
• Plugins with only bin and config do not install correctly #7154 (issue: #7152)
• bin/plugin removes itself [ISSUE] #6745
• Removing plugin does not fail when plugin dir is read only #6735 (issue: #6546)
• Fix github download link when using specific version #6321
• Properly quote $JAVA in bin/plugin #5765
• NPE in PluginsService when starting elasticsearch with a wrong user #5196 (issues: #4186, #5195)
• Upgrading analysis plugins fails #5034 (issues: #4936, #5030)

Query DSL

• Add support for disable_coord param to terms query #12756 (issue: #12755)
• Do not track named queries that are null #12691 (issue: #12683)
• multi_match query applies boosts too many times. #12294
• QueryString ignores maxDeterminizedStates when creating a WildcardQuery #12269 (issue: #12266)
• Rewrite set twice in WildcardQueryParser [ISSUE] #12207
• Fix RegexpQueryBuilder#maxDeterminizedStates #12083 (issue: #11896)
• CommonTermsQuery fix for ignored coordination factor #11780 (issue: #11730)
• Fix support for _name in some queries #11694
• Better exception if array passed to term query. #11384 (issue: #11246)
• Query DSL: Fix bool parsing. #11120 (issue: #10985)
• Score value is 0 in _explanation with random_score query [ISSUE] #10742
• Avoid NPE during query parsing #10333
• Function score: Apply min_score to sub query score if no function provided #10326 (issue: #10253)
• function_score: undo "Remove explanation of query score from functions" #9826
• Fix wrong error messages in MultiMatchQueryParser #8597
• DateMath: Fix semantics of rounding with inclusive/exclusive ranges. #8556 (issue: #8424)
• Minor fixes to the match query #8352 (issue: #6932)
• Make simple_query_string leniency more fine-grained #8162 (issue: #7967)
• Fix NumberFormatException in Simple Query String Query #7876 (issue: #7875)
• Empty bool {} should return match_all #7347 (issue: #7240)
• Function Score: Fix explain distance string #7248
• Function Score: Remove explanation of query score from functions #7245
• Cache range filter on date field by default #7122 (issue: #7114)
• Throw exception if function in function score query is null #6784 (issue: #6292)
• QueryParser can return null from a query #6723 (issue: #6722)
• Fix MatchQueryParser not parsing fuzzy_transpositions #6300
• Range/Term query/filter on dates fail to handle numbers properly #5969
• Fixing questionable PNRG behavior #5613 (issues: #5454, #5578)
• Add slop to prefix phrase query after parsing query string #5438 (issues: #5005, #5437)
• Allow edit distances > 2 on FuzzyLikeThisQuery #5374 (issue: #5292)
• Use FieldMapper to create the low level term queries in CommonTermQuery #5273 (issue: #5258)
• Make exists/missing behave consistently with exists/missing. #5145 (issue: #5142)
• Allow specifying nested fields in simple_query_string #5110 (issue: #5091)
• Added exception to match and multi-match queries if passed an invalid type param #4971 (issue: #4964)
• Filtered query parses _name incorrectly [ISSUE] #4960
• Never cache a range filter that uses the now date expression. #4828 (issue: #4846)

Query Refactoring

• Query DSL: don’t cache type filter in DocumentMapper #12447

REST

• Return 408 REQUEST_TIMEOUT if _cluster/health times out #12780
• fielddata_fields query string parameter was ignored. #11368 (issue: #11025)
• Update RestRequest.java #11305
• Render non-elasticsearch exception as root cause #10850 (issue: #10836)
• Add fielddata_fields to the REST spec #9399 (issues: #4492, #9398)
• Get field mapping api should honour pretty flag #8806 (issue: #6552)
• Passing fielddata_fields as a non array causes OOM #8203
• Reroute API response didn’t filter metadata #7523 (issue: #7520)
• Allows all options for expand_wildcards parameter #7290 (issue: #7258)
• Added support for empty field arrays in mappings #7271 (issue: #6133)
• Empty HTTP body returned from _recovery API on empty cluster [ISSUE] #5743
• Search template: Put source param into template variable #5598 (issue: #5556)
• Fix possible exception in toCamelCase method #5207
• Source filtering with wildcards broken when given multiple patterns #5133 (issue: #5132)
• Ignore case when parsing script_values_sorted|unique in aggregations. #5010 (issue: #5009)
• scroll REST API should support source parameter #4942 (issue: #4941)
• Fix potential NPE when no source and no body #4932 (issues: #4892, #4900, #4901, #4902, #4903, #4924)
• mtermvectors REST API should support source parameter #4910 (issue: #4902)
• percolate REST API should support source parameter #4909 (issue: #4903)
• mpercolate REST API should support source parameter #4908 (issue: #4900)
• msearch REST API should support source parameter #4905 (issue: #4901)
• mget REST API should support source parameter #4893 (issue: #4892)
• Cluster state toXContent serialization only returns needed data #4889 (issue: #4885)

Recovery

• Endless recovery loop with indices.recovery.file_chunk_size=0Bytes #12919
• Rethrow exception during recovery finalization even if source is not broken #12667
• Check for incompatible mappings while upgrading old indices #12406 (issue: #11857)
• Fix MapperException detection during translog ops replay #11583 (issue: #11363)
• Fix recovered translog ops stat counting when retrying a batch #11536 (issue: #11363)
• Restart recovery upon mapping changes during translog replay #11363 (issue: #11281)
• Add engine failure on recovery finalization corruption back #11241
• Decrement reference even if IndexShard#postRecovery barfs #11201
• Fail recovery if retry recovery if resetRecovery fails #11149
• Refactor state format to use incremental state IDs #10316
• RecoveryState.File.toXContent reports file length as recovered bytes #10310
• Fail shard when index service/mappings fails to instantiate #10283
• Gateway: improve assertion at the end of shard recovery #10028
• Synchronize RecoveryState.timer methods #9943
• Don’t recover from buggy version #9925 (issues: #7210, #9922)
• Fix deadlock problems when API flush and finish recovery happens concurrently #9648
• Handle corruptions during recovery finalization #9619
• Mapping update task back references already closed index shard #9607
• Update access time of ongoing recoveries #9506 (issue: #8720)
• Cleaner interrupt handling during cancellation #9000
• Harden recovery for old segments #8399
• Prefer recovering the state file that uses the latest format. #8343
• Change check for finished to a ref count check #8271 (issue: #8092)
• RecoveriesCollection.findRecoveryByShard should call recoveryStatus.tryIncRef before accessing fields #8231 (issue: #8092)
• Mapping check during phase2 should be done in cluster state update task #7744
• Don’t update indexShard if it has been removed before #7509
• Increment Store refcount on RecoveryTarget #6844
• Recovery from local gateway should re-introduce new mappings #6659
• Honor time delay when retrying recoveries #6226
• Do not start a recovery process if the primary shard is currently allocated on a node which is not part of the cluster state #6024

Scripting

• Consistently name Groovy scripts with the same content #12296 (issue: #12212)
• Execute Scripting Engine before searching for inner templates in template query #11512
• Allow script language to be null when parsing #10976 (issue: #10926)
• File scripts cache key to include language and prevent conflicts #10033
• Avoid unnecessary utf8 conversion when creating ScriptDocValues for a string field. #9557 (issue: #6908)
• Disallow method pointer expressions in Groovy scripting #9509
• Make _score in groovy scripts comparable #9094 (issue: #8828)
• Function score and optional weight : avg score is wrong #9004 (issue: #8992)
• Return new lists on calls to getValues. #8591 (issue: #8576)
• Add score() back to AbstractSearchScript #8417 (issues: #8377, #8416)
• Clear the GroovyClassLoader cache before compiling #8062 (issues: #7658, #8073)
• Fix NPE in ScriptService when script file with no extension is deleted #7953 (issue: #7689)
• Scripting: Wrap groovy script exceptions in a serializable Exception object #6628 (issue: #6598)
• Remove ScriptDocValues.EMPTY. #5650 (issue: #5646)

Scroll

• Append the shard top docs in such a way to prevent AOOBE #11978 (issue: #7926)

Search

• Never cache match_all queries. #13032
• _all: Stop NPE querying _all when it doesn’t exist #12495 (issue: #12439)
• Free all pending search contexts if index is closed or removed #12180 (issue: #12116)
• Release search contexts after failed dfs or query phase for dfs queries #11434 (issue: #11400)
• Don’t truncate TopDocs after rescoring #11342 (issues: #11277, #7707)
• Matched queries: Remove redundant and broken code #10694 (issue: #10661)
• Make sure that named filters/ queries defined in a wrapped query/filters aren’t lost #9166 (issue: #6871)
• Fix paging on strings sorted in ascending order. #9157 (issue: #9136)
• Terms filter lookup caching should cache values, not filters. #9027 (issues: #1, #2)
• Refactor term analysis for simple_query_string prefix queries #8435
• Use ConcurrentHashMap in SCAN search to keep track of the reader states. #7499 (issue: #7478)
• Make ignore_unmapped work for sorting cross-index queries. #7039 (issue: #2255)
• Query DSL: Improved explanation for match_phrase_prefix #6767 (issue: #2449)
• The query_string cache should returned cloned Query instances. #6733 (issue: #2542)
• Match query with operator and, cutoff_frequency and stacked tokens #6573
• XFilteredQuery default strategy prefers query first in the deleted docs … #6254 (issue: #6247)
• limit filter returns wrong results if deleted document are present [ISSUE] #6234
• Use default forceAnalyzeQueryString if no query builder is present #6217 (issue: #6215)
• Read full message on free context #6148 (issues: #5730, #6147)
• Missing scroll id now returns 404 #6040 (issue: #5729)
• Search might not return on thread pool rejection #6032 (issue: #4887)
• Scroll api reduce phase fails if shard failures occur #6022
• Fix setting of readerGen in BytesRefOrdValComparator on nested documents. #5986
• Improved SearchContext.addReleasable. #5799 (issue: #5703)
• Replace InternalSearchResponse#EMPTY with InternalSearchResponse#empty() #5775
• The clear scroll apis should optionally accepts a scroll_id in the request body. #5734 (issue: #5726)
• Make sure successful operations are correct if second search phase is fast #5713
• Do not propagate errors from onResult to onFailure. #5629
• Fix IndexShardRoutingTable’s shard randomization to not throw out-of-bounds exceptions. #5561 (issue: #5559)
• Convert TermQuery to PrefixQuery if PHRASE_PREFIX is set #5553 (issue: #5551)
• Use patched version of TermsFilter to prevent using wrong cached results #5393 (issue: #5363)
• Fix SearchContext occasionally closed prematurely #5170 (issue: #5165)
• Exposed shard id related to a failure in delete by query #5125 (issue: #5095)
• Fix AndDocIdSet#IteratorBasedIterator to not violate initial doc state #5070 (issue: #5049)

Search Templates

• Fix JSON encoding for Mustache templates. #10820 (issue: #5473)
• Ensure internal scope extrators are always operating on a Map #6326 (issue: #6318)
• Fix TemplateQueryParser swallows additional parameters #5933
• Made template endpoint compatible with search endpoint #5619 (issue: #5550)

Settings

• Do not swallow exceptions thrown while parsing settings #13039 (issue: #13028)
• Add explicit check that we have reached the end of the settings stream when parsing settings #12451 (issue: #12382)
• Medium Interval time for ResourceWatcher should be 30 seconds #12423
• Copy the classloader from the original settings when checking for prompts #12419 (issue: #12340)
• Replace references to ImmutableSettings with Settings #11843
• Do not prompt for node name twice #11668 (issue: #11564)
• Always normalize root paths during resolution of paths #11446 (issue: #11426)
• Prevent changing the number of replicas on a closed index #11410 (issue: #9566)
• Read configuration file with .yaml suffix #10909 (issue: #9706)
• Validate number_of_shards/_replicas without index setting prefix #10701 (issue: #10693)
• Fix handling of IndicesOptions in update settings REST API #10030
• Reset TieredMP settings only if the value actually changed #9497 (issue: #8890)
• cluster.routing.allocation.disk.threshold_enabled accepts wrong values [ISSUE] #9309
• Ensure fields are overriden and not merged when using arrays #8381 (issue: #6887)
• Tab characters in YAML should throw an exception #8355 (issue: #8259)
• Dynamic changes to max_merge_count are now picked up by index throttling #8136 (issue: #8132)
• Validate create index requests' number of primary/replica shards #7496 (issue: #7495)
• LogConfigurator resolveConfig also reads .rpmnew or .bak files #7457
• Fix bug in PropertyPlaceholder and add unit tests #6034

Shadow Replicas

• Fail engine without marking it as corrupt when recovering on SharedFS #11933 (issue: #11788)

Snapshot/Restore

• Improve repository verification failure message #11925 (issue: #11922)
• Improve logging of repository verification exceptions. #11763 (issue: #11760)
• Blob store shouldn’t try deleting the write.lock file at the end of the restore process #11517
• Move in-progress snapshot and restore information from custom metadata to custom cluster state part #11486 (issue: #8102)
• Sync up snapshot shard status on a master restart #11450 (issue: #11314)
• Fix cluster state task name for update snapshot task #11197
• Don’t reuse source index UUID on restore #10367
• Separate repository registration #10354 (issue: #10351)
• Automatically add "index." prefix to the settings are changed on restore if the prefix is missing #10269 (issue: #10133)
• Delete operation should ignore finalizing shards on nodes that no longer exist #9981 (issue: #9924)
• Allow deletion of snapshots with corrupted snapshot files #9569 (issue: #9534)
• Better handling of index deletion during snapshot #9418 (issue: #9024)
• Add validation of restored persistent settings #9051 (issue: #8830)
• Improve snapshot creation and deletion performance on repositories with large number of snapshots #8969 (issue: #8958)
• Switch to write once mode for snapshot metadata files #8782 (issue: #8696)
• Restore with wait_for_completion:true should wait for succesfully restored shards to get started #8545 (issue: #8340)
• Keep the last legacy checksums file at the end of restore #8358 (issue: #8119)
• Restore of indices that are only partially available in the cluster #8341 (issue: #8224)
• Fix snapshotting of a single closed index #8047 (issue: #8046)
• Make it possible to delete snapshots with missing metadata file #7981 (issue: #7980)
• Make sure indices cannot be renamed into restored aliases #7918 (issue: #7915)
• Allow to get metadata from arbitrary commit points #7376
• Improve recovery / snapshot restoring file identity handling #7351
• Fix NPE in SnapshotsService on node shutdown #7322 (issue: #6506)
• Fail restore if snapshot is corrupted #6938
• Add ability to snapshot replicating primary shards #6139 (issue: #5531)
• Fix for hanging aborted snapshot during node shutdown #5966 (issue: #5958)
• Fix snapshot status with empty repository #5791 (issue: #5790)
• Add retry mechanism to get snapshot method #5411
• Restore of an existing index using rename doesn’t completly open the index after restore [ISSUE] #5212
• Restore process should replace the mapping and settings if index already exists #5211 (issue: #5210)
• Handle "true"/"false" in snapshot api for "include_global_state" #4956 (issue: #4949)

Stats

• Use time with nanosecond resolution calculated at the executing node #12346 (issue: #12345)
• Failure during the fetch phase of scan should invoke the failed fetch… #12087 (issue: #12086)
• Fix wrong reused file bytes in Recovery API reports #11965 (issue: #11876)
• Fix RecoveryState timestamps #11871 (issue: #11870)
• Translog: stats fail to serialize size #10105
• Translog: make sure stats’s op count and size are in sync #10041
• Fix open file descriptors count on Windows #9397 (issue: #1563)
• Relax restrictions on filesystem size reporting in DiskUsage #9283 (issues: #9249, #9260)
• Fix wrong search stats groups in indices API #8950 (issue: #7644)
• Fix Bloom filter ram usage calculation #8584 (issue: #8564)
• Filter indices stats for translog #8263 (issue: #8262)
• Stats: _status with #shards >> queue capacity failing with BroadcastShardOperationFailedException [ISSUE] #7916
• Update action returns before updating stats for NONE operations #7639
• NPE in ShardStats when routing entry is not set yet on IndexShard #7358 (issue: #7356)
• Recovery API should also report ongoing relocation recoveries #6585
• Indices stats options #6390
• Fix recovery percentage > 100% #6138 (issue: #6113)
• Disabled query size estimation in percolator #5372 (issue: #5339)
• Use num of actual threads if busiestThreads is larger #4928 (issue: #4927)

Store

• Ensure we mark store as corrupted if we fail to read the segments info #11230 (issue: #11226)
• Fix NPE when checking for active shards before deletion #11110 (issue: #10172)
• Shard not deleted after relocation if relocated shard is still in post recovery #10172 (issue: #10018)
• Only ack index store deletion on data nodes #9672 (issue: #9605)
• Only fail recovery if files are inconsistent #8779
• Use Lucene checksums if segment version is >= 4.9.0 #8599 (issue: #8587)
• Calculate Alder32 Checksums for legacy files in Store#checkIntegrity #8407
• Add BWC layer to .si / segments_N hashing to identify segments accurately #7436 (issues: #7351, #7434)
• Ignore segments.gen on metadata snapshots #7379
• DistributorDirectory shouldn’t search for directory when reading existing file #7323 (issue: #7306)
• Delete unallocated shards under a cluster state task #6902
• Searcher might not be closed if store hande can’t be obtained #5884

Suggesters

• Prevent DirectCandidateGenerator to reuse an unclosed analyzer #12670
• Ensure empty string completion inputs are not indexed #11158 (issue: #10987)
• Ensure collate option in PhraseSuggester only collates on local shard #11156 (issue: #9377)
• Make GeoContext mapping idempotent #10602 (issues: #10581, #8937)
• Return an HTTP error code when a suggest request failed instead of 200 #10104
• Fix CompletionFieldMapper to correctly parse weight #8197 (issue: #8090)
• Infinite loop in GeolocationContextMapping [ISSUE] #7433
• Bugs with encoding multiple levels of geo precision #7369 (issue: #7368)
• Completion mapping type throws a misleading error on null value #6926 (issue: #6399)
• Tie-break suggestions by term #5978
• Fix Lucene’s getFiniteStrings to not consume Java stack #5927
• Geo context suggester: Require precision in mapping #5647 (issue: #5621)
• ContextSuggester: Adding couple of tests to catch more bugs #5596 (issue: #5525)
• Category type should be called "category" instead of "field" in context suggester #5469
• Two bugfixes for the completion format #4973
• marvel.agent Background thread had an uncaught exception: java.lang.NullPointerException [ISSUE] #4970
• NullPointerException (NPE) in completion suggester requests [ISSUE] #4788

Term Vectors

• Make sure filter is correctly parsed for multi-term vectors #12312 (issue: #12311)
• ShardTermVectorsService calls docFreq() on unpositioned TermsEnum [ISSUE] #10660

Top Hits

• Protected against size and offset larger than total number of document in a shard #12518 (issue: #12510)
• Inconsistent sorting of top_hits fixed [ISSUE] #7697
• Properly support top_hits aggregation in a nested and reverse_nested aggregations. #7164 (issue: #3022)
• Make _source parsing in top_hits aggregation consistent with the search api #6997
• Track scores should be applied properly for top_hits aggregation. #6934

Translog

• Ignore EngineClosedException during translog fysnc #12384
• Don’t convert possibly corrupted bytes to UTF-8 #11911
• Mark translog as upgraded in the engine even if a legacy generation exists #11860 (issue: #11858)
• Fail #snapshot if translog is closed #10809 (issue: #10807)
• Translog leaks filehandles if it’s corrupted or truncated #8372
• Better support for partial buffer reads/writes in translog infrastructure #6576 (issue: #6441)
• Lower the translog flush triggers to workaround #6363 [ISSUE] #6377

Tribe Node

• System properties and configuration settings must not be forwarded to tribe clients #9721 (issue: #9576)
• Remove closed indices from cluster state #9334
• Fix possible NPE in TribeNodeService #5645 (issue: #5643)
• Blocking writes on a tribe node creates a "blocks" tribe [ISSUE] #5389

Upgrade API

• Fix version check in bytes to upgrade that spans major versions #9340
• Fix upgrade logic to check for major version bump. #8013

Regressionsedit

CRUD

• Indexing a document fails when setting version=0 & version_type=external [ISSUE] #5662

Core

• Switch back to ConcurrentMergeScheduler as the default [ISSUE] #5817

Discovery

• Restore preference to latest unicast pings describing the same node #7702 (issues: #5413, #7558)

Internal

• Restore streamInput() performance over PagedBytesReference. #5589

Mapping

• Mapping With a null Default Timestamp Causes NullPointerException on Merge #9205 (issue: #9204)
• Object and Type parsing: Fix include_in_all in type #6353 (issues: #6093, #6304)

Network

• Only resolve host if explicitly allowed. #12986

Upgradesedit

Core

• Upgrade to Lucene 5.2.1. #11662
• Upgrade to Lucene 5.2 #11534
• Upgrade Jackson to 2.5.3 #11307
• Upgrade to lucene-5.2.0-snapshot-1681024 #11296
• Upgrade to lucene-5.2.0-snapshot-1680200. #11218
• Upgrade to lucene-5.2.0-snapshot-1678978. #11125
• Upgrade to HPPC 0.7.1 #11035
• Upgrade to lucene-5.2-snapshot-1675363. #10727 (issue: #10728)
• Upgrade to Lucene 5.2 r1675100 #10699
• Upgrade to Lucene-5.2-snapshot-1674183. #10641
• Upgrade to Lucene 5.2 r1673726 #10612
• Upgrade to lucene-5.2.0-snapshot-1673124. #10562
• Update forbiddenapis to version 1.8 #10555
• Upgrade to lucene-5.1.0-snapshot-1671894. #10468
• Update to Lucene 5.1 snapshot r1671277 #10435
• Upgrade to Jackson 2.5.1 #10210
• Upgrade to Jackson 2.5.1 #10134
• Upgrade to lucene r1662607 #9915 (issue: #1)
• Upgrade to Lucene r1660560 #9746
• Upgrade to Lucene snapshot r1656366 #9524 (issue: #8870)
• Upgrade to lucene r1654549 snapshot #9402
• Upgrade to lucene-5.1.0-snapshot-1652032. #9318
• Upgrade to lucene 5 r1650327 #9206
• Upgrade to current Lucene 5.0.0 snapshot #8588
• Upgrade master to lucene 5.0 snapshot #8347
• Upgrade to Jackson 2.4.2 #7934 (issue: #7932)
• Upgrade to Lucene 4.10.1 snapshot #7844 (issue: #7905)
• Upgrade Guava to 18.0. #7593 (issue: #6268)
• Upgrade to Lucene 4.10 #7584
• Version bump HPPC to 0.6.0 #7139
• Upgrade Jackson to 2.4.1 #6757
• Upgrade to Lucene 4.9 #6623
• Upgrade to Guava 17 #5953
• Upgrade to Lucene 4.8.0 #5932
• Update forbidden-apis to 1.5.1 and remove the relaxed failOnMissingClasses setting, fix typo #5863
• Upgrade to Lucene 4.7.2 #5802
• Update JNA to 4.1.0, properly warn on error, hint at noexec mount #5636 (issue: #5493)
• Upgrade to Lucene 4.7.1 #5635
• Update to forbidden-apis 1.4.1 #5495 (issue: #5492)
• Move master to Java 1.7 #5268 (issue: #5267)
• Upgrade to Lucene 4.6.1 #4898 (issue: #4897)

Dates

• Update joda-time to v2.7 #9610

Geo

• Upgrade to Spatial4j 0.4.1 and JTS 1.13 #5336 (issues: #5279, #5286)

Network

• Update Netty to version 3.10.3.Final #12310
• Upgrade to Netty 3.10.3 #11304
• Upgrade netty to 3.10.0.Final #9132
• Upgrade to Apache HttpComponents client 4.3.5 #7346 (issue: #7342)
• Upgrade to Netty 3.9.3.Final #7328
• Upgrade to netty 3.9.1 #6331

Scripting

• Upgrade groovy from 2.4.0 to 2.4.4 #12288
• Update Groovy dependency to 2.4.0 #9520

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