Elasticsearch: v9.4.8 Release

127 Commits in this Release

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

[9.4] ESQL: Fix nested fields conflicting with object fields (#160356)

Authored September 29, 2026

Rework netty http flow control (#156618) (#159437)

Authored September 16, 2026

[9.4] Use LimitedCharSequence for limiting the reads of chunk separator regexes (#158743) (#159350)

Authored September 15, 2026

[9.4] Strengthen build-tools-internal plugin test coverage (#158873) (#158924)

Authored September 10, 2026

Backport of #160207 to `9.4`. (#160528)

Authored September 29, 2026

Bump jackson to 2.21.6 (#157295) (#158548)

Authored September 9, 2026

ESQL: LuceneSourceOperator should take into consideration the buffered rows and don't yet mark as finished (#159438)

Authored September 16, 2026

[9.4] Release top_hits hits when CCS merge reduce fails (#160363) (#160372)

Authored September 29, 2026

Properly handle negative OS/process CPU load value (#150364) (#160093)

Authored September 23, 2026

[9.4] Make transport versions CSV update idempotent (#159744) (#159898)

Authored September 21, 2026

Remove explainUnassignedShardAllocation side effects (#157766) (#159519)

Authored September 16, 2026

ESQL: properly handle LOADed unmapped_fields object-typed fields by returning NULL value (#159491) (#159660)

Authored September 17, 2026

[build-tools] TestKit home per func test worker (#160122) (#160562)

Authored September 29, 2026

[9.4] Handle refresh exceptions in ensureShardSearchActive (#159526) (#159593)

Authored September 17, 2026

Fix H3 great-circle latitude correction edge selection (#160228) (#160335)

Authored September 29, 2026

[9.4] Fix replica divergence on sequence numbers disabled indices (#158870) (#158946)

Authored September 10, 2026

Update nmcp gradle plugin to 1.6.2 (#159101) (#159223)

Authored September 15, 2026

Netty upgrade 4.1.137.Final (#157348) (#159558)

Authored September 17, 2026

[9.4] Add search result order insensitive assertion to AbstractSemanticCrossClusterSearchTestCase (#160557) (#160577)

Authored September 29, 2026

ESQL: Fix analyzer loop on repeated conversions (#159257) (#159317)

Authored September 15, 2026

[9.4] Fix testConcurrentSnapshotDeleteAndDeleteIndex (#158765) (#159309)

Authored September 15, 2026

Clean up `BatchedRerouteService` exception logging (#159289) (#159454)

Authored September 16, 2026

Upgrade Jackson to 2.21.7 (#160501) (#160515)

Authored September 29, 2026

[9.4] Add extra logging to BulkChallengeRestIT (#160192) (#160200)

Authored September 24, 2026

[9.4] Reduce the batch size to match BulkChallengeRestIT batch size (#160069) (#160078)

Authored September 23, 2026

[9.4] Allow reroute exceptions in BatchedRerouteServiceTests#testNotifiesOnFailure (#159565) (#159587)

Authored September 17, 2026

Unmute test, fixed by #160078 (#160127)

Authored September 23, 2026

[build-tools] Seed wrapper cache for BWC func tests (#159923) (#160097)

Authored September 23, 2026

[9.4] Reduce number of disruptions and unmute SearchWithRandomDisconnectsIT (#146669) (#159619)

Authored September 17, 2026

Fix request breaker leak in the rank feature phase (#158951) (#159047)

Authored September 11, 2026

Mute org.elasticsearch.versioning.ConcurrentSeqNoVersioningIT testSeqNoCASLinearizability #159150

Authored September 13, 2026

Fix dependency verification for okio-jvm 3.17.0 (#159388)

Authored September 15, 2026

Mute org.elasticsearch.xpack.logsdb.qa.BulkChallengeRestIT testEsqlTermsAggregation #159745

Authored September 18, 2026

Mute org.elasticsearch.xpack.ml.qa.MlYamlRestIT test {p0=ml/delete_expired_data/Test delete expired data with body parameters} #147656

Authored September 12, 2026

Mute org.elasticsearch.gradle.internal.InternalDistributionBwcSetupPluginFuncTest builds distribution from branches via archives extractedAssemble #159719

Authored September 21, 2026

Mute org.elasticsearch.xpack.ml.integration.MlJobIT testPutJob_GivenFarequoteConfig #159088

Authored September 11, 2026

Mute org.elasticsearch.xpack.logsdb.qa.BulkChallengeRestIT testEsqlTermsAggregationByMethod #159816

Authored September 20, 2026

Mute org.elasticsearch.xpack.esql.common.spatial.H3SphericalUtilTests testRandomBounds #159682

Authored September 18, 2026

Mute org.elasticsearch.xpack.security.transport.CrossClusterApiKeySignatureManagerTests testSignAndVerifyDifferentPayloadFailsPKCS12orBCFKS #159806

Authored September 20, 2026

Mute org.elasticsearch.xpack.logsdb.qa.BulkStoredSourceChallengeRestIT testMatchAllQuery #160023

Authored September 22, 2026