- Added extensive gRPC support including new query types, pluggable interceptors, bulk endpoint formats (SMILE/CBOR/YAML) and improved error handling.
- Introduced pull‑based ingestion enhancements (async periodic flush, dynamic consumer config, message mappers, pointer‑based lag metric) plus new index.creation_date setting, ForkJoinPool type, and repository encryption flags.
- Breaking changes: removed MultiCollectorWrapper, dropped MERGED_SEGMENT_WARMER experimental flag, changed WildcardFieldMapper default doc values to true, and altered Engine method visibility; also replaced java.security.AccessController ...
3.4.0
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Added APIs for modifying data stream backing indices, multivalue doc count aggregation, and Hive pull‑based ingestion.