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Elasticsearch v9.4.8

Elasticsearch: v9.4.8 Release

Release date:
September 30, 2026
Previous version:
v9.4.7 (released September 9, 2026)
Magnitude:
3,310 Diff Delta
Contributors:
34 total committers
Data confidence:
Commits:
126 impacting commits

126 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
[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
[build-tools] Seed wrapper cache for BWC func tests (#159923) (#160097)
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
[9.4] Reduce the batch size to match BulkChallengeRestIT batch size (#160069) (#160078)
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 testEsqlTermsAggregationByMethod #159816
Authored September 20, 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.xpack.logsdb.qa.BulkChallengeRestIT testEsqlTermsAggregation #159745
Authored September 18, 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.security.transport.CrossClusterSigningConfigReloaderIntegTests testInitialBadDependentFileAvailableAfterUpdate #159809
Authored September 20, 2026
Mute org.elasticsearch.compute.operator.fuse.LinearScoreEvalOperatorTests testMultivaluedGroupColumnProducesWarning #152929
Authored September 22, 2026
Mute org.elasticsearch.cluster.routing.BatchedRerouteServiceTests testNotifiesOnFailure #159564
Authored September 17, 2026
Mute org.elasticsearch.xpack.spatial.common.H3SphericalUtilTests testRandomBounds #159682
Authored September 18, 2026

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Top Contributors in v9.4.8

ivancea
reugn
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