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Elasticsearch version 7.4.1

Also see Breaking changes in 7.4.

Enhancements

Engine

Avoid unneeded refresh with concurrent realtime gets #47895
sync before trimUnreferencedReaders to improve index preformance #47790 (issues: #46201, #46203)
Limit number of retaining translog files for peer recovery #47414

Infra/Circuit Breakers

Emit log message when parent circuit breaker trips #47000

Machine Learning

Throttle the delete-by-query of expired results #47177 (issues: #47003)
The machine learning native processes are now arranged in a .app directory structure on macOS, to allow for notarization on macOS Catalina. #593

Bug fixes

Aggregations

DocValueFormat implementation for date range fields #47472 (issues: #47323, #47469)

Allocation

Dangling indices strip aliases #47581

Analysis

Reset Token position on reuse in predicate_token_filter #47424 (issue: #47197)

Authentication

Fix AD realm additional metadata #47179 (issue: #45848)

Authorization

Use should clause instead of filter when querying native privileges #47019

CCR

Do not auto-follow closed indices #47721 (issue: #47582)
Relax maxSeqNoOfUpdates assertion in FollowingEngine #47188 (issue: #47137)

Cluster Coordination

Omit writing index metadata for non-replicated closed indices on data-only node #47285 (issue: #47276)

Features/ILM+SLM

Throw error retrieving non-existent SLM policy #47679 (issue: #47664)

Features/Indices APIs

Fix Rollover error when alias has closed indices #47148 (issue: #47146)

Features/Java High Level REST Client

Fix ILM HLRC Javadoc→Documentation links #48083

Features/Monitoring

[Monitoring] Add new cluster privilege now necessary for the stack monitoring ui #47871

Infra/Scripting

Drop stored scripts with the old style-id #48078 (issue: #47593)

Machine Learning

Fix detection of syslog-like timestamp in find_file_structure #47970
Reinstate ML daily maintenance actions #47103 (issue: #47003)
Fix possibility of crash when calculating forecasts that overflow to disk #688

Network

Fix es.http.cname_in_publish_address Deprecation Logging #47451 (issue: #47436)

SQL

SQL: Fix issue with negative literels and parentheses #48113 (issue: #48009)
SQL: add "format" for "full" date range queries #48073 (issue: #48033)
SQL: Allow whitespaces in escape patterns #47577 (issue: #47401)
SQL: fix multi full-text functions usage with aggregate functions #47444 (issue: #47365)
SQL: wrong number of values for columns #42122

Search

Fix alias field resolution in match query #47369

Snapshot/Restore

Fix Bug in Azure Repo Exception Handling #47968
Fix Snapshot Corruption in Edge Case #47552 (issues: #46250, #47550)

Store

Allow truncation of clean translog #47866

Transform

Fix bwc serialization with 7.3 #48021

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https://www.elastic.co/guide/en/elasticsearch/reference/7.17/release-notes-7.4.1.html