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Elasticsearch version 7.15.2

Also see Breaking changes in 7.15.

Enhancements

Authorization

Better logging and internal user handling for operator privileges #79331

Bug fixes

Aggregations

Possible source of leaked delayable writables #80166

Authorization

Marking operator user no longer depends on license state #79595
Preserve request headers in a mixed version cluster #79412 (issue: #79354)
Try set operator user header on each node #79528

Geo

Fix circuit breaker leak in MultiTerms aggregation #79362
Guard geoline aggregation from parents aggegator that emit empty buckets #79129 (issue: #79128)

Indices APIs

Correctly merge lists with primitives #80336 (issue: #78211)

Infra/Core

Treat system indices with unexpected type as needing upgrade #78622 (issue: #78456)

License

Put License API can return HTTP 500 #79093 (issue: #74058)

Machine Learning

Add bucket_count_ks_test results reader for internode communication #79063
Fix cancellation of named pipe connection on Linux if the remote end does not connect within the configured timeout period #2102

Mapping

Fix execution of exists query within nested queries on field with doc_values disabled #78841 (issue: #76362)

Network

Ensure indexing_data CCR requests are compressed #79413

Snapshot/Restore

Create cache files with CREATE_NEW & SPARSE options #79371
Quicker shared cache file preallocation #79447

TLS

Fix parsing of PBES2 encrypted PKCS#8 keys #78904 (issues: #8, #32021, #78901)

Upgrades

Packaging

Bump bundled JDK to 17.0.1 #80034 (issue: #80001)

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https://www.elastic.co/guide/en/elasticsearch/reference/7.17/release-notes-7.15.2.html