Also see Breaking changes in 2.0.
Bug fixesedit
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Aggregations
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[Children agg] fix bug that prevented all child docs from being evaluated #15457
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Index APIs
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Field stats: Index constraints should remove indices in the response if the field to evaluate is empty #14868
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Field stats: Fix NPE for index constraint on empty index #14841
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Internal
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Throw a meaningful error when loading metadata and an alias and index have the same name #14842 (issue: #14706)
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Mapping
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Multi field names may not contain dots #15118 (issue: #14957)
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Translog
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Fail and close translog hard if writing to disk fails #15420 (issue: #15333)
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Prevent writing to closed channel if translog is already closed #15012 (issue: #14866)
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Don’t delete temp recovered checkpoint file it was renamed #14872 (issue: #14695)