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Elasticsearch version 8.17.2

Also see Breaking changes in 8.17.

Bug fixes

Authentication

Fix NPE on disabled API auth key cache #120483

Data streams

Map scope.name as a dimension #120590

ES|QL

Use field_caps native nested fields filtering #117201 (issue: #117054)

Machine Learning

Fix infer on and elasticsearch service endpoint created with a deployment id #121428
Fix inference update API calls with task_type in body or deployment_id defined #121231
Skip Usage stats update when ML is disabled #121559 (issue: #121532)

Mapping

Fix synthetic source issue with deeply nested ignored source fields #121715
Lower _source.mode mapping attribute deprecation issue level #120059

Ranking

Fix LTR rescorer throws local model reference is null on multi-shards index when explained is enabled #120717 (issue: #120739)
LTR sometines throw NullPointerException: Cannot read field "approximation" because "top" is null #120809
Normalize negative scores for text_similarity_reranker retriever #120930 (issue: #120201)
Update Text Similarity Reranker to Properly Handle Aliases #120062 (issue: #119617)

Search

Add back keep_alive to async_search.submit rest-api-spec #120781
Fix NPE caused by race condition in async search when minimise round trips is true #117504
Fix potential file leak in ES816BinaryQuantizedVectorsWriter #120014 (issue: #119981)
Use approximation to advance matched queries #120133 (issue: #120130)

Snapshot/Restore

Cheaper snapshot-related toString() impls #121283
Issue S3 web identity token refresh call with sufficient permissions #119748 (issue: #119747)

Enhancements

Ingest Node

Improve memory aspects of enrich cache #120256 (issues: #96050, #120021)

Known issues

VALUES aggregate function can run for a long, long time when collecting many, many groups. Hundreds of thousands of groups can run on one thread for many minutes and millions of groups run for days. It is O(n²) with the number of groups. These will not respond to the tasks cancellation API the whole time. Fixed by #123073 and available in 8.16.5, 8.17.3, 8.18.0, and all releases after that.

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https://www.elastic.co/guide/en/elasticsearch/reference/8.17/release-notes-8.17.2.html