Also see Breaking changes in 5.2.
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Aggregations
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Restore support for the
include/pattern
syntax. #23140 (issue: #22933)
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Cluster
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Don’t set local node on cluster state used for node join validation #23311 (issue: #21830)
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Cluster allocation explain to never return empty response body #23054
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Index APIs
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Ensure shrunk indices carry over version information from its source #22469 (issue: #22373)
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Internal
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Always restore the ThreadContext for operations delayed due to a block #23349
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Java REST Client
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RestClient asynchronous execution should not throw exceptions #23307
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Network
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Plugin Ingest Attachment
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REST
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Stats
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