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Elasticsearch version 8.16.4

Also see Breaking changes in 8.16.

Bug fixes

Aggregations

Aggregations cancellation after collection #120944 (issue: #108701)

Data streams

Map scope.name as a dimension #120590

ES|QL

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

Mapping

Fix synthetic source issue with deeply nested ignored source fields #121715

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

Fix potential file leak in ES816BinaryQuantizedVectorsWriter #120014 (issue: #119981)

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)

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https://www.elastic.co/guide/en/elasticsearch/reference/8.17/release-notes-8.16.4.html