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Elasticsearch version 7.2.1

Also see Breaking changes in 7.2.

Enhancements

Infra/Core

Add default CLI JVM options #44545 (issue: #42021)

Infra/Plugins

Do not checksum all bytes at once in plugin install #44649 (issue: #44545)

Machine Learning

Improve message when native controller cannot connect #43565 (issue: #42341)
Introduce a setting for the process connect timeout #43234

Bug fixes

Analysis

Issue deprecation warnings for preconfigured delimited_payload_filter #43684 (issues: #26625, #43568)

Authentication

Fix credential encoding for OIDC token request #43808 (issue: #43709)

Data Frame

Reorder format priorities in dest mapping #43602
Adjust error message #43455
Size the GET stats search by number of Ids requested #43206 (issue: #43203)

Distributed

Fix DefaultShardOperationFailedException subclass xcontent serialization #43435 (issue: #43423)

Engine

AsyncIOProcessor preserve thread context #43729

Features/CAT APIs

Fix indices shown in _cat/indices #43286 (issues: #33888, #38824, #39933)

Features/ILM

Account for node versions during allocation in ILM Shrink #43300 (issue: #41879)

Features/Indices APIs

Check shard limit after applying index templates #44619 (issues: #34021, #44567, #44619)
Validate index settings after applying templates #44612 (issues: #34021, #44567)
Prevent NullPointerException in TransportRolloverAction #43353 (issue: #43296)

Infra/Packaging

Restore setting up temp dir for windows service #44541
Fix the bundled jdk flag to be passed through windows startup #43502

Machine Learning

Fix datafeed checks when a concrete remote index is present #43923
Don’t persist model state at the end of lookback if the lookback did not generate any input #527 (issue: #519)
Don’t write model size stats when job is closed without any input #516 (issue: #394)

Mapping

Prevent types deprecation warning for indices.exists requests #43963 (issue: #43905)
Add include_type_name in indices.exitst REST API spec #43910 (issue: #43905)
Fix index_prefix sub field name on nested text fields #43862 (issue: #43741)

Network

Reconnect remote cluster when seeds are changed #43379 (issue: #37799)

SQL

Fix NPE in case of subsequent scrolled requests for a CSV/TSV formatted response #43365 (issue: #43327)
Increase hard limit for sorting on aggregates #43220 (issue: #43168)

Search

Fix wrong logic in match_phrase query with multi-word synonyms #43941 (issue: #43308)
Fix UOE on search requests that match a sparse role query #43668 (issue: #42857)
Fix propagation of enablePositionIncrements in QueryStringQueryBuilder #43578 (issue: #43574)
Fix round up of date range without rounding #43303 (issue: #43277)

Security

SecurityIndexSearcherWrapper doesn’t always carry over caches and similarity #43436

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https://www.elastic.co/guide/en/elasticsearch/reference/7.17/release-notes-7.2.1.html