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Elasticsearch v9.4.5

Elasticsearch: v9.4.5 Release

Release date:

August 5, 2026

Previous version:

v9.4.4 (released July 15, 2026)

Magnitude:

4,016 Diff Delta

Contributors:

39 total committers

Data confidence:

Commits:

126

126 Commits in this Release

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

[Backport] Fix IndexRecoveryIT.testSourceThrottling (#154121)

Authored July 16, 2026

[9.4] ESQL: Don't accidentally add flattened subfields (#155840)

Authored August 5, 2026

[9.4] [Inference API] Fix associating an inference endpoint to an ML node deployment (#153688) (#154873)

Authored July 23, 2026

[9.4] ESQL: Purge INSIST from the codebase (#153845) (#154081)

Authored July 16, 2026

[9.4] [Inference API] Deploy text embedding models before validation call (#153886) (#154986)

Authored July 24, 2026

Tighten up `Expect: 100-continue` handling (#154546) (#154611)

Authored July 21, 2026

[9.4] Fix view+alias data deduplication in ViewResolver (#154694) (#154945)

Authored July 24, 2026

Refactor RecoveryIT to use junit rule best approach (#151839) (#154564)

Authored July 21, 2026

[9.4] ESQL: Fix one of the causes of losing warnings (#154016) (#154138)

Authored July 17, 2026

[9.4] Upgrade the version of jackson to 2.18.9 (#154569) (#154686)

Authored July 22, 2026

[9.4] Account scripted-field heap in request circuit breaker (#152718) (#154379)

Authored July 20, 2026

[9.4] [Inference API] Delete default endpoints using master node action only (#154735) (#154890)

Authored July 24, 2026

Bug fix: default AMD value resolution in FromAggregateMetricDouble (#153805) (#154680)

Authored July 22, 2026

Reserve regexp automaton memory on the circuit breaker before building it (#155076) (#155245)

Authored July 28, 2026

9.4 backport propagate nullable fixes (#155596)

Authored July 31, 2026

Fix instability of SharedBlobCacheServiceTests.testFetchRegion (#153500) (#155644)

Authored August 4, 2026

Fix EUCLIDEAN score clamping order in BBQ vector scorer (#155630) (#155692)

Authored August 3, 2026

Fix flaky ES92GpuHnswWriteGraphTests float vector comparison (#155935) (#155957)

Authored August 5, 2026

Cache little-endian float layout in DiskBBQ scalar corrections loop (#154373) (#155489)

Authored July 30, 2026

[9.4] Trip request breaker on phrase and term suggesters (#154837) (#155631)

Authored July 31, 2026

[9.4] ESQL: Fix FROM_BASE64 generating wrong non-UTF strings (#155757)

Authored August 4, 2026

Unmute encryption-at-rest suite timeout tests on 9.4 (#155558)

Authored July 31, 2026

ESQL: Avoid MAX_INT loop on Repeat (#154295) (#154562)

Authored July 21, 2026

Upgrade the version of log4j to 2.26.1 (#154115) (#154548)

Authored July 21, 2026

Allow GC of closed search contexts in ES|QL (#155418) (#155438)

Authored July 29, 2026

Remove 9.3 from snapshot bwcs after 9.5 was released (#155966)

Authored August 5, 2026

Backport apache http client 5 upgrade (#155666)

Authored August 2, 2026

Increase suite timeouts for encryption-at-rest CI step (#154076) (#154106)

Authored July 16, 2026

ESQL: Unmutes some ESQL warnings tests (#155366)

Authored July 29, 2026

Fix bbq_flat yaml test vector scores (#153444) (#154101)

Authored July 16, 2026

[9.4] Limit number_of_fragments in highlighting to prevent OOM crash (#155507) (#155947)

Authored August 5, 2026

LookupJoinParserTests: Don't generate unquoted kw (#151854) (#155347)

Authored July 29, 2026

[9.4] ESQL: Re-type a TEXT data type to KEYWORD to fulfill the CASE resolveType contract (#154287) (#154393)

Authored July 20, 2026

unmute #152601 (#154263)

Authored July 17, 2026

Updating simulated exception thrown in RRF and linear retriever IT tests to avoid shutting down the shard (#151105) (#154517)

Authored July 21, 2026

Remove `testChildrenTasksCancelledOnTimeout` (#155344) (#155362)

Authored July 29, 2026

Fix flaky ShardLimitValidatorTests.testValidateShardLimitOpenIndices (#155235)

Authored July 28, 2026

[9.4] Fix `TransportClusterStateActionDisruptionIT` (#155461) (#155514)

Authored July 30, 2026

Fix zero-width tty in credential auto-config tests (#154248) (#154496)

Authored July 21, 2026

Fix CC-unsafe provider in ElasticsearchCluster.module(TaskProvider<Sync>) (#154170) (#154296)

Authored July 19, 2026

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Top Contributors in v9.4.5

jonathan-buttner

inespot

ivancea

GalLalouche

michalborek

DaveCTurner

drempapis

craigtaverner

piotrsulkowski-elastic

ChrisHegarty

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Release Notes Published

Downloads: https://elastic.co/downloads/elasticsearch Release notes: https://www.elastic.co/docs/release-notes/elasticsearch#elasticsearch-9.4.5-release-notes