Also see Breaking changes in 2.0.
Bug fixesedit
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Aggregations
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Pass extended bounds into HistogramAggregator when creating an unmapped aggregator #14742 (issue: #14735)
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Allocation
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Fix calculation of next delay for delayed shard allocation #14765
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Take ignored unallocated shards into account when making allocation decision #14678 (issue: #14670)
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Only allow rebalance operations to run if all shard store data is available #14591 (issue: #14387)
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Delayed allocation can miss a reroute #14494 (issues: #14010, #14011, #14445)
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CAT API
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Properly set indices and indicesOptions on subrequest made by /_cat/indices #14360
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Cluster
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Handle shards assigned to nodes that are not in the cluster state #14586 (issue: #14584)
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Core
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Fork Lucene PatternTokenizer to apply LUCENE-6814 (closes #13721) #14571 (issue: #13721)
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Fielddata
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Don’t cache top level field data for fields that don’t exist #14693
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Index APIs
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Field stats: Added
format option for index constraints #14823 (issue: #14804)
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Mapping
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Mapping: Allows upgrade of indexes with only search_analyzer specified #14677 (issue: #14383)
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Plugin Delete By Query
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Fix Delete-by-Query with Shield #14658 (issue: #14527)
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Delete by query to not wrap the inner query into an additional query element #14302 (issue: #13326)
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Plugins
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Use plugin name from plugin’s properties file rather than plugin’s class #14479 (issue: #14357)
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Fix plugin list command error message #14288 (issue: #14287)
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Fix HTML response during redirection #11374 (issue: #11370)
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REST
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XContentFactory.xContentType: allow for possible UTF-8 BOM for JSON XContentType #14611 (issue: #14442)
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Scripting
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Backport #8201 to 2.0 and disable by default #14283 (issue: #14273)
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Stats
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Omit current* stats for OldShardStats #13801 (issue: #13386)
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Translog
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Translog recovery can repeatedly fail if we run out of disk #14695
Regressionsedit