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Elasticsearch version 7.5.1

Also see Breaking changes in 7.5.

Enhancements

Features/Watcher

Log attachment generation failures #50080

Network

Netty4: switch to composite cumulator #49478

Bug fixes

Authentication

Fix iterate-from-1 bug in smart realm order #49473

CRUD

Do not mutate request on scripted upsert #49578 (issue: #48670)

Cluster Coordination

Make elasticsearch-node tools custom metadata-aware #48390

Engine

Account trimAboveSeqNo in committed translog generation #50205 (issue: #49970)

Features/ILM+SLM

Handle failure to retrieve ILM policy step better #49193 (issue: #49128)

Features/Java High Level REST Client

Support es7 node http publish_address format #49279 (issue: #48950)

Geo

Fix handling of circles in legacy geo_shape queries #49410 (issue: #49296)

Infra/Packaging

Extend systemd timeout during startup #49784 (issue: #49593)

Machine Learning

Use query in cardinality check #49939
Fix expired job results deletion audit message #49560 (issue: #49549)
Apply source query on data frame analytics memory estimation #49527 (issue: #49454)
Stop timing stats failure propagation #49495

Mapping

Improve DateFieldMapper ignore_malformed handling #50090 (issue: #50081)

Recovery

Migrate peer recovery from translog to retention lease #49448 (issue: #45136)

SQL

COUNT DISTINCT returns 0 instead of NULL for no matching docs #50037 (issue: #50013)
Fix LOCATE function optional parameter handling #49666 (issue: #49557)
Fix NULL handling for FLOOR and CEIL functions #49644 (issue: #49556)
Handle NULL arithmetic operations with INTERVALs #49633 (issue: #49297)
Fix issue with GROUP BY YEAR() #49559 (issue: #49386)
Fix issue with CASE/IIF pre-calculating results #49553 (issue: #49388)
Fix issue with folding of CASE/IIF #49449 (issue: #49387)
Fix issues with WEEK/ISO_WEEK/DATEDIFF #49405 (issues: #48209, #49376)

Snapshot/Restore

Fix Index Deletion during Snapshot Finalization #50202 (issues: #45689, #50200)

Transform

Fix possible audit logging disappearance after rolling upgrade #49731 (issue: #49730)

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https://www.elastic.co/guide/en/elasticsearch/reference/7.17/release-notes-7.5.1.html