Also see Breaking changes in 7.17.
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 7.17.16 patch release contains a fix for a potential security vulnerability. Please see our security advisory for more details.
- Upgrade reactor netty http to v1.0.39 and reactor core to v3.4.34 #102629