Elasticsearch: v9.4.2 Release

94 Commits in this Release

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

Migrate to log4j2 annotation processor for plugins (#136983) (#148685)

Authored May 11, 2026

GPU codec: fall back to CPU graph build on flush when GPU is busy (#149373) (#149475)

Authored May 20, 2026

Aggs: Account aggs uncompressed size on coordinator reduction (#148885) (#149728)

Authored May 22, 2026

Use search threadpool for coordination in ES|QL (#149034) (#149186)

Authored May 15, 2026

Fix InvalidMappedField equals/hashCode and split out InvalidMappedTsField (#146117) (#149518)

Authored May 20, 2026

[9.4] Migrate :distribution:docker yaml tests to Testcontainers (#148452) (#148627)

Authored May 8, 2026

Aggs: Fix auto_date_histogram and date_histogram inside a global agg (#147427) (#148831)

Authored May 12, 2026

Upgrade to log4j 2.26.0 (#132166) (#148939)

Authored May 13, 2026

Fix: propagate ReloadableCustomAnalyzer reloads through AnalyzerWrapper subclasses (#147695) (#149077)

Authored May 14, 2026

[9.4] Normalize `_timeseries` to JSON for stored source (#148716) (#149281)

Authored May 19, 2026

Revert "Merge branch '9.4' of github.com:elastic/elasticsearch into 9.4"

Authored May 8, 2026

[9.4] ESQL: Fix "optimized incorrectly" error from project reorder (#149053) (#149377)

Authored May 19, 2026

Make streaming fetch chunk size cluster-dynamic (#148705) (#148836)

Authored May 12, 2026

Honor task settings for Amazon Bedrock and Google Vertex chat completion (#149268) (#149725)

Authored May 22, 2026

[9.4] Add deprecation message for ESQL log (#149013) (#149554)

Authored May 21, 2026

Improve inference field gathering performance during rewrite (#149539) (#149587)

Authored May 21, 2026

[9.4] Update RuleQueryBuilder to eagerly rewrite organic query (#149323) (#149330)

Authored May 18, 2026

[Transform] Only run next search once (#148268) (#148868)

Authored May 12, 2026

[9.4] Capture exceptions in processing too and log them as failures (#148362) (#149110)

Authored May 15, 2026

Default exclude_inference_fields to exclude_vectors at REST (#148527) (#149734)

Authored May 22, 2026

[Inference API] Fixing potential NPE if InferenceContext is null (#148921) (#149007)

Authored May 13, 2026

ESQL:DS: ORC: fix missing class (#147807) (9.4 backport) (#149661)

Authored May 22, 2026

Fix CCR follow to handle indexing_complete race (#145304) (#148582)

Authored May 8, 2026

Bump versions after 9.4.1 release

Authored May 12, 2026

Bump otel SDK to 1.62.0 for CVE-2026-45292 (#149607) (#149817)

Authored May 25, 2026

[CI] Reduce size of overprovisioned BWC and packaging instances (#148435) (#148630)

Authored May 8, 2026

[9.4] Stabilize fetch chunk tests: breaker busy-wait, avoid acquireResponseStream poll leak (#148026) (#148936)

Authored May 13, 2026

ES|QL RerankIT cheaper parameters (#148614)

Authored May 8, 2026

[9.4] Override the merge policy in CompletionStatsCacheTests (#149288) (#149456)

Authored May 20, 2026

Add per-lib test entitlement policy support for gpu-codec (#149300) (#149370)

Authored May 19, 2026

ESQL: Fix capability in test (#148269) (#148903)

Authored May 12, 2026

9.4 - unmute KnnSearchIT testKnnSearchWithScroll (#148634)

Authored May 20, 2026

Unmute histogram isNotNullFilter CSV tests (#149364)

Authored May 19, 2026

Fix FsBlobContainer.moveBlobAtomic fallback on CIFS filesystems (#148777) (#148818)

Authored May 12, 2026

Node-reduce driver should not release search contexts on failure (#145960) (#149218)

Authored May 15, 2026

Fix AIOOBE in date_histogram with hard_bounds outside data (#148765) (#149180)

Authored May 15, 2026

test fix

Authored May 11, 2026

[9.4] Default PromQL and Prometheus discovery APIs to metrics-* (#148489, #148770) (#148843)

Authored May 12, 2026

[Inference API] Use image/jpeg instead of image/jpg for inference validation MIME type (#148793) (#148869)

Authored May 12, 2026

Mute org.elasticsearch.reindex.ReindexBasicTests testReindexFailsWhenSourceIndexIsClosed #149234

Authored May 16, 2026