- Adds many new features: support for dot‑named fields, forward translog reading, HTTP/3 server support, gRPC circuit‑breaker, index‑level encryption for snapshots, HLL field mapper, intra‑segment search, and X‑Request‑Id header.
- Introduces concurrency improvements such as concurrent translog recovery, additional codec registration hooks, and a new libs/netty4 module shared across netty‑based plugins.
- Fixes numerous bugs including snapshot rename limits, segment replication during rolling restarts, aggregation size issues, and restores proper header propagation for gRPC transports.
3.5.0
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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.
Added a pluggable data format engine with Lucene support, dynamic property definitions, tiered storage APIs (WritableWarm, Hot/Warm tiering) and a block‑cache SPI.