Elasticsearch: v9.5.1 Release

54 Commits in this Release

Ordered by the degree to which they evolved the repo in this version.

Fix circuit breaker undercounting memory for wildcard and regexp queries (#155368) (#155452)

Authored July 30, 2026

[9.5] [Test] Fix SearchCommitPrefetcherIT.testSearchNodePrefetchesOnlyLatestGenerationOnFirstCommitNotification (#152207) (#155975)

Authored August 5, 2026

Unmute RejectionActionIT and add logging (#155914) (#155993)

Authored August 5, 2026

[9.5] Fix TDigest merge test tolerance (#155835) (#155854)

Authored August 4, 2026

Use readArraySize in readImmutableMap and readImmutableOpenMap (#154525) (#155749)

Authored August 3, 2026

Backport apache http client 5 upgrade (#155664)

Authored August 3, 2026

[9.5] uninstall encryption key custom after KeyRotationIT tests (#155503) (#155591)

Authored July 31, 2026

[9.5] Adding ensureGreen check in RankEvalRequestIT to ensure all indices are available (#154681) (#155716)

Authored August 3, 2026

[Test] Fix MetadataCreateIndexServiceIT.testCreateIndexBatching (#153972) (#154277)

Authored August 3, 2026

Fix floating-point precision in rate test reference (#153617) (#155717)

Authored August 3, 2026

[9.5] ESQL: Remove geo from MV_SORT allowed inputs and added error tests (#154417) (#155536)

Authored August 5, 2026

Clamp merge scheduler thread count when it exceeds max merge count (#155693) (#155821)

Authored August 4, 2026

[9.5] Trip request breaker on phrase and term suggesters (#154837) (#155629)

Authored August 3, 2026

chore(deps): update wolfi (versioned) (#155863)

Authored August 4, 2026

[9.5] Limit number_of_fragments in highlighting to prevent OOM crash (#155507) (#155946)

Authored August 5, 2026

Migrate repository-old-versions fixture to unit rule based test cluster and test container (#154518) (#155571)

Authored July 31, 2026

Unmute encryption-at-rest suite timeout test on 9.5 (#155557)

Authored July 31, 2026

Fix VirtualBatchedCompoundCommitsIT.testVirtualBatchedCompoundCommitChunksPressure (#154829) (#155543)

Authored July 30, 2026

Isolate old-repo test repo dirs per test class (#155550) (#155587)

Authored July 31, 2026

Fix smart retry pruning of parameterized tests (#155253) (#155605)

Authored July 31, 2026

Parse scroll id from a bounded byte array (#154542) (#155479)

Authored July 30, 2026

[Test] Fix flaky `StatelessReshardIT::testExplainApi` (#155423) (#155486)

Authored July 30, 2026

Fix for index.auto_expand_replicas takes priority over ILM "Set Replicas" option [#150407] (#155279) (#155718)

Authored August 3, 2026

chore: deps(updatecli): bump ironbank policy to 1.0.1 (#155739) (#155741)

Authored August 3, 2026

ci(updatecli): pin ironbank policy to UBI 9 (#155728) (#155735)

Authored August 3, 2026

Fix EUCLIDEAN score clamping order in BBQ vector scorer (#155630) (#155691)

Authored August 3, 2026

Cache little-endian float layout in DiskBBQ scalar corrections loop (#154373) (#155488)

Authored July 30, 2026

Fix `TransportClusterStateActionDisruptionIT` (#155461) (#155513)

Authored July 30, 2026

[CI] Add required Quemu setup for dra builds (#155789) (#155808)

Authored August 4, 2026

[CI] Fix multiarch testfixture deployment (#155624) (#155763)

Authored August 3, 2026

Migrate snapshot-based-recoveries qa/fs to JUnit rule cluster (#154487) (#155523)

Authored July 30, 2026

Add columnar as valid changelog area (#155657) (#155758)

Authored August 3, 2026

Limit dot-separated identifiers per version part (#154572) (#155620)

Authored August 3, 2026

FixedRequestHandler drains request body before responding (#155726) (#155861)

Authored August 4, 2026

[CI] Bump binfmt QEMU to fix arm64 tar extraction (#155888) (#155903)

Authored August 4, 2026

ESQL: Fix FROM_BASE64 generating wrong non-UTF strings (#154955) (#155755)

Authored August 4, 2026

Upgrade JANSI to 2.4.3 to fix terminal detection on zlib-ng based Linux (#155853) (#155882)

Authored August 4, 2026

[CI] Create docker-container buildx builder for multi-platform DRA builds (#155826) (#155845)

Authored August 4, 2026

Apply retention schedule to SLM tests only when needed for specific test (#155721) (#155828)

Authored August 4, 2026

Update ironbank base image from 9.7 to 9.8 (#155395) (#155410)

Authored July 30, 2026