- Fixed bugs: bulk request hang when an index is deleted, case‑insensitive/escaped wildcard queries, array‑index errors on wildcard fields, and negative fielddata stats.
- Improved circuit breaker and query result handling to prevent negative estimated limits.
- Updated many dependencies (Netty, Avro, Bouncy Castle, ZooKeeper, Log4j, Jetty, etc.) and upgraded the bundled JDK to version 21.0.11.
2.19.6
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Added a pluggable data format engine with Lucene support, dynamic property definitions, tiered storage APIs (WritableWarm, Hot/Warm tiering) and a block‑cache SPI.