Also see Breaking changes in 2.3.
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REST
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Search
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Settings
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Deprecate camelCase settings magic #17875 (issue: #8988)
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Analysis
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Analyze API : Fix/deprecated filters in analyze in 2x #17844 (issue: #15189)
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Aggregations
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Aggregations: Adds serialisation of sigma to extended_stats_bucket pipeline aggregation #17703 (issue: #17701)
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ExtendedStatsAggregator should also pass sigma to emtpy aggs. #17388 (issue: #17362)
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Allocation
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Rebalancing policy shouldn’t prevent hard allocation decisions #17698 (issues: #14057, #14259)
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When considering the size of shadow replica shards, set size to 0 #17509 (issue: #17460)
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Logging
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Add missing index name to search slow log. #17818 (issue: #17025)
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Mapping
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Fail if an object is added after a field with the same name. #17568 (issue: #17567)
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More Like This
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REST
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Fixes reading of CORS pre-flight headers and methods #17524 (issue: #17523)
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index is a required url part for update by query #17503
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Recovery
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Backports Notify GatewayRecoveryListener on failure #17805
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Snapshot/Restore
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On restore, selecting concrete indices can select wrong index #17715