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Elasticsearch version 8.19.20

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Elasticsearch version 8.19.20

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Also see Breaking changes in 8.19.

Breaking changes

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ILM
  • When number_of_replicas is specified in the ILM allocate action, auto_expand_replicas is now explicitly removed from the index settings. #155279 (issue: #150407)

Bug fixes

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Aggregations
  • Overestimate memory usage of delayable writables #155015
Analysis
  • Add a check against self-referencing filters #154793
  • Trip request breaker on term and phrase suggesters based on backing array estimates #154837
ES|QL
  • Avoid an integer overflow loop in the REPEAT function #154295
  • Fix FROM_BASE64 generating invalid non-UTF-8 strings. Previously it could create binary values that ES|QL does not support in other operations; only valid UTF-8 is supported, and invalid cases now return null with a warning. #154955
  • Fix MV_SORT incorrectly allowing geospatial types, which are not sortable #154417
  • Fix a cause of lost ES|QL warnings by preserving thread context #154016
  • Fix incorrect inclusion of flattened subfields in multi-index queries #154508 (issues: #154743, #154484, #154011)
  • Remove quadratic complexity from DROP with field name patterns #154716
Inference
  • Deploy text embedding models before the validation call #153886 (issue: #144871)
  • Fix associating an inference endpoint with an ML node deployment #153688 (issue: #144860)
  • Fix SSE parser handling of empty lines and byte order marks #154632
  • Fix SSE parsing across network read boundaries #154155 (issue: #153980)
Infra/CLI
  • Upgrade JANSI to 2.4.3 to fix terminal detection on zlib-ng based systems (EL10) #155853 (issue: #154510)
Machine Learning
  • Fix double decrement of the pending inference request count #154577 (issue: #154483)
  • Use the model’s deployment_id when waiting for model allocation #153213 (issue: #146835)
Mapping
  • Fix wildcard queries on keyword fields whose normalizer rewrites wildcard characters #153582 (issue: #150699)
Ranking
  • Add a hardcoded limit on nested retrievers #154814
Search
  • Apply max_regex_length limit to intervals regexp and wildcard rules #155231
  • Bound numeric string length before parsing #154689
  • Ensure cancelled _field_caps tasks are removed from the tasks API #153831 (issue: #137475)
  • Limit dot-separated identifiers per version part #154572
  • Parse scroll ID from a bounded byte array #154542
  • Reserve regexp automaton memory on the circuit breaker before building it #155076
  • Use readArraySize in readImmutableMap and readImmutableOpenMap #154525

Upgrades

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Authentication
  • Upgrade OpenTelemetry in ms-graph-authz #151968
FIPS
  • Update Bouncy Castle FIPS TLS libraries #155937
Infra/Core
  • Upgrade lz4-java to 1.11.1 #155598
Security
  • Upgrade Bouncy Castle to 1.85 #155819
  • Upgrade Jackson to 2.18.9 #154569
  • Upgrade Log4j to 2.26.1 #154115
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