- Added a full suite of Workload Management APIs (Create, Update, Delete QueryGroup, stats, rejection logic, failure tracking) and new thread‑context permissions.
- Introduced streaming bulk indexing API, experimental search replica shard type for reader‑writer separation, and multiple Concurrent Segment Search enhancements (composite aggregation scripting, max slice count, pluggable deciders).
- Enhanced Remote Publication with checksum validation, incremental cluster‑state upload, hashed‑prefix support, plus snapshot performance optimizations, a new approximate range‑query framework, and numerous bug fixes and dependency upgrades.
2.17.0
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Added APIs for modifying data stream backing indices, multivalue doc count aggregation, and Hive pull‑based ingestion.