IMPORTANT: No additional bug fixes or documentation updates will be released for this version. For the latest information, see the current release documentation.

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5.2.1 Release Notes

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5.2.1 Release Notes

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Also see Breaking changes in 5.2.

Deprecations

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Geo

Geo distance range deprecation #22835

Enhancements

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Allocation

Include stale replica shard info when explaining an unassigned primary #22826

Bug fixes

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Cache

Invalidate cached query results if query timed out #22807 (issue: #22789)

Mapping

Range types causing GetFieldMappingsIndexRequest to fail due to NullPointerException in RangeFieldMapper.doXContentBody when include_defaults=true is on the query string #22925
Disallow introducing illegal object mappings (double ..) #22891 (issue: #22794)

Plugin Ingest Attachment

Add missing mime4j library #22799 (issue: #22764)

Plugin Lang Painless

Don’t allow casting from void to def in painless #22969 (issue: #22908)
Fix def invoked qualified method refs #22918

Reindex API

Reindex: do not log when can’t clear old scroll #22942 (issue: #22937)
Fix reindex-from-remote from <2.0 #22931 (issue: #22893)

Settings

Expose search.highlight.term_vector_multi_value as a node level setting #22999

Regressions

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Core

Source filtering: only accept array items if the previous include pattern matches #22593 (issue: #22557)

Upgrades

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Internal

Upgrade to Lucene 6.4.1. #22978

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