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Elasticsearch version 7.5.2

Enhancements

Features/Ingest

Fork recursive calls in Foreach processor #50514

Infra/Core

Fix unintended debug logging in subclasses of TransportMasterNodeAction #50839 (issues: #50056, #50074, #50076)

Bug fixes

Analysis

Fix caching for PreConfiguredTokenFilter #50912 (issue: #50734)

CRUD

Block too many concurrent mapping updates #51038 (issue: #50670)

Engine

Account soft-deletes in FrozenEngine #51192 (issue: #50775)

Features/ILM+SLM

Fix SLM check for restore in progress #50868

Features/Ingest

Fix ingest simulate response document order if processor executes async #50244

Features/Java Low Level REST Client

Improve warning value extraction performance in response #50208 (issue: #24114)

Machine Learning

Fixes potential memory corruption or inconsistent state when background persisting categorizer state. #921

Mapping

Ensure that field collapsing works with field aliases. #50722 (issues: #32648, #50121)
Fix meta version of task index mapping #50363 (issue: #48393)

Recovery

Check allocation ID when failing shard on recovery #50656 (issue: #50508)

SQL

Change the way unsupported data types fields are handled #50823
Optimization fixes for conjunction merges #50703 (issue: #49637)
Fix issue with CAST and NULL checking. #50371 (issue: #50191)
Fix NPE for JdbcResultSet.getDate(param, Calendar) calls #50184 (issue: #50174)

Search

Fix upgrade of custom similarity #50851 (issue: #50763)

Security

Always consume the request body of has_privileges API #50298 (issue: #50288)

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https://www.elastic.co/guide/en/elasticsearch/reference/7.17/release-notes-7.5.2.html