- Added Tiered Caching framework with pluggable Ehcache disk cache, configurable policies, stale‑key management, and serializer integration (experimental).
- Enhanced Admission Control with IO usage tracking and IO‑based controller, introduced built‑in secure transports and a new setting to disable pending flush checks.
- Delivered new capabilities such as force‑merge on primary shards, Kuromoji completion analyzer, async gauge metrics, dynamic query counters, plus extensive bug fixes and library version upgrades.
2.13.0
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Added APIs for modifying data stream backing indices, multivalue doc count aggregation, and Hive pull‑based ingestion.