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Elasticsearch version 7.17.16

Also see Breaking changes in 7.17.

Known issues

High Memory Pressure due to a GC change in JDK 21

This version of Elasticsearch is bundled with JDK 21. In JDK 21 Preventive GC has been removed. This may lead to increased memory pressure and an increased number of CircuitBreakerExceptions when retrieving large documents under some particular load. (issue: #99592)

If you needed to explicitly enable Preventive GC for your workload in a previous Elasticsearch version, we recommend you avoid to upgrade to this version, as the settings to enable Preventive GC have been removed from JDK 21.
The deprecated index.mapper.dynamic setting can break your cluster. It can only be set using the Update index settings API. Symptoms include nodes failing to start or shards failing to allocate. Do not use this setting in versions prior to 7.17.22. The bug is fixed in 7.17.22. (issue: #109160)

Security updates

The 7.17.16 patch release contains a fix for a potential security vulnerability. Please see our security advisory for more details.

Bug fixes

Infra/Circuit Breakers

Add more logging to the real memory circuit breaker and lower minimum interval #102396

Infra/Scripting

Improve painless error wrapping #100872

Transform

Ensure transform updates only modify the expected transform task #102934 (issue: #102933)

Upgrades

Snapshot/Restore

Upgrade reactor netty http to v1.0.39 and reactor core to v3.4.34 #102629

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https://www.elastic.co/guide/en/elasticsearch/reference/7.17/release-notes-7.17.16.html