3.9.0

Official OpenSearch changelog summary with source attribution, release tags, and community reactions.

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OpenSearch·Sep 29, 2026, 09:54 PMDeprecationMay break your integrationAI-assisted summary

Summary

- Added a suite of new APIs and modules including DELETE task API, deployment drain/finish for zero‑downtime, adaptive per‑action concurrency, virtual‑thread task executor, extensible payload decoder, dynamic field type inference SPI, cr...
- Delivered many performance and reliability enhancements such as cluster.blocks.read.auto setting, remote store flush controls, bucket key optimizations, Lucene read speedups, wildcard/regex query improvements, replica promotion on fail...
- Fixed numerous bugs across queries, aggregations, snapshots, routing, caches, startup, and streaming; updated core dependencies and libraries to address security CVEs (CVE‑2026‑63136, CVE‑2026‑49844) and performed extensive maintenance...

featurebugfixdeprecationsecuritysource failing

Official source Last checked Oct 4, 2026, 1:03 AM

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