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Elasticsearch version 7.3.1

Also see Breaking changes in 7.3.

Enhancements

CCR

Include leases in error message when operations are no longer available #45681

Infra/Core

Add OCI annotations and adjust existing annotations #45167 (issues: #45162, #45166)

Infra/Settings

Normalize environment paths #45179 (issue: #45176)

Machine Learning

Outlier detection should only fetch docs that have the analyzed fields #44944

SQL

Remove deprecated use of "interval" from date_histogram usage #45501 (issue: #43922)

Bug fixes

Aggregations

Fix early termination of aggregators that run with breadth-first mode #44963 (issue: #44909)

Analysis

Enable reloading of synonym_graph filters #45135 (issue: #45127)

Authentication

Do not use scroll when finding duplicate API key #45026
Fix broken short-circuit in getUnlicensedRealms #44399

CCR

Clean up ShardFollowTasks for deleted indices #44702 (issue: #34404)

CRUD

Allow _update on write alias #45318 (issue: #31520)

Data Frame

Fix starting a batch transform after stopping at runtime #45340 (issues: #44219, #45339)
Fix null aggregation handling in indexer #45061 (issue: #44906)

Distributed

Ensure AsyncTask#isScheduled remains false after close #45687 (issue: #45576)
Fix clock used in update requests #45262 (issue: #45254)
Restore DefaultShardOperationFailedException’s reason during deserialization #45203

Features/Watcher

Fix watcher HttpClient URL creation #45207 (issue: #44970)

Infra/Packaging

Use bundled JDK in Sys V init #45593 (issue: #45542)

Infra/Settings

Fix a bug with elasticsearch.common.settings.Settings.processSetting #44047 (issue: #43791)

MULTIPLE AREA LABELS

Fix a bug where mappings are dropped from rollover requests. #45411 (issue: #45399)
Sparse role queries can throw an NPE #45053

Machine Learning

Check dest index is empty when starting data frame analytics #45094
Catch any error thrown while closing data frame analytics process #44958
Only trap the case where more rows are supplied to outlier detection than expected. Previously, if rows were excluded from the transform after supplying the row count in the configuration, we detected the inconsistency and failed outlier detection. However, this situation legitimately happens in cases where the field values are non-numeric or array valued. #569

Mapping

Make sure to validate the type before attempting to merge a new mapping. #45157 (issues: #29316, #43012)

SQL

Adds format parameter to range queries for constant date comparisons #45326 (issue: #45139)
Uniquely named inner_hits sections for each nested field condition #45039 (issues: #33080, #44544)
Fix URI path being lost in case of hosted ES scenario #44776 (issue: #44721)

Search

Prevent Leaking Search Tasks on Exceptions in FetchSearchPhase and DfsQueryPhase #45500
Fix an NPE when requesting inner hits and _source is disabled. #44836 (issue: #43517)

Security

Fix .security-* indices auto-create #44918
Use system context for looking up connected nodes #43991 (issue: #43974)

Upgrades

Infra/Packaging

Upgrade to JDK 12.0.2 #45172

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https://www.elastic.co/guide/en/elasticsearch/reference/7.17/release-notes-7.3.1.html