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Elasticsearch version 8.15.0

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Elasticsearch version 8.15.0

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Also see Breaking changes in 8.15.

Known issues

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  • The pytorch_inference process used to run Machine Learning models can consume large amounts of memory. In environments where the available memory is limited, the OS Out of Memory Killer will kill the pytorch_inference process to reclaim memory. This can cause inference requests to fail. Elasticsearch will automatically restart the pytorch_inference process after it is killed up to four times in 24 hours. (issue: #110530)
  • Pipeline aggregations under time_series and categorize_text aggregations are never returned (issue: #111679)
  • Elasticsearch will not start on Windows machines if [bootstrap.memory_lock is set to true](https://www.elastic.co/guide/en/elasticsearch/reference/current/setup-configuration-memory.html#bootstrap-memory_lock). Either downgrade to an earlier version, upgrade to 8.15.1, or else follow the recommendation in the manual to entirely disable swap instead of using the memory lock feature (issue: #111847)
  • The took field of the response to the Bulk API is incorrect and may be rather large. Clients which incorrectly assume that this value will be within a particular range (e.g. that it fits into a 32-bit signed integer) may encounter errors (issue: #111854)
  • Elasticsearch will not start if custom role mappings are configured using the xpack.security.authc.realms.*.files.role_mapping configuration option. As a workaround, custom role mappings can be configured using the REST API (issue: #112503)

Breaking changes

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Cluster Coordination
  • Interpret ?timeout=-1 as infinite ack timeout #107675
Inference API
  • Replace model_id with inference_id in GET inference API #111366
Rollup
  • Disallow new rollup jobs in clusters with no rollup usage #108624 (issue: #108381)
Search
  • Change skip_unavailable remote cluster setting default value to true #105792

Bug fixes

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Aggregations
  • Don’t sample calls to ReduceContext#consumeBucketsAndMaybeBreak ins InternalDateHistogram and InternalHistogram during reduction #110186
  • Fix ClassCastException in Significant Terms #108429 (issue: #108427)
  • Run terms concurrently when cardinality is only lower than shard size #110369 (issue: #105505)
Allocation
  • Fix misc trappy allocation API timeouts #109241
  • Fix trappy timeout in allocation explain API #109240
Analysis
  • Correct positioning for unique token filter #109395
Authentication
  • Add comma before charset parameter in WWW-Authenticate response header #110906
  • Avoid NPE if users_roles file does not exist #109606
  • Improve security-crypto threadpool overflow handling #111369
Authorization
  • Fix trailing slash in security.put_privileges specification #110177
  • Fixes cluster state-based role mappings not recovered from disk #109167
  • Handle unmatching remote cluster wildcards properly for IndicesRequest.SingleIndexNoWildcards requests #109185
Autoscaling
  • Expose ?master_timeout in autoscaling APIs #108759
CRUD
  • Update checkpoints after post-replication actions, even on failure #109908
Cluster Coordination
  • Deserialize publish requests on generic thread-pool #108814 (issue: #106352)
  • Fail cluster state API if blocked #109618 (issue: #107503)
  • Use scheduleUnlessShuttingDown in LeaderChecker #108643 (issue: #108642)
Data streams
  • Apm-data: set concrete values for metricset.interval #109043
  • Ecs@mappings: reduce scope for ecs_geo_point #108349 (issue: #108338)
  • Include component templates in retention validaiton #109779
Distributed
  • Associate restore snapshot task to parent mount task #108705 (issue: #105830)
  • Don’t detect PlainActionFuture deadlock on concurrent complete #110361 (issues: #110181, #110360)
  • Handle nullable DocsStats and StoresStats #109196
Downsampling
  • Support flattened fields and multi-fields as dimensions in downsampling #110066 (issue: #99297)
ES|QL
  • ESQL: Change "substring" function to not return null on empty string #109174
  • ESQL: Fix Join references #109989
  • ESQL: Fix LOOKUP attribute shadowing #109807 (issue: #109392)
  • ESQL: Fix Max doubles bug with negatives and add tests for Max and Min #110586
  • ESQL: Fix IpPrefix function not handling correctly ByteRefs #109205 (issue: #109198)
  • ESQL: Fix equals hashCode for functions #107947 (issue: #104393)
  • ESQL: Fix variable shadowing when pushing down past Project #108360 (issue: #108008)
  • ESQL: Validate unique plan attribute names #110488 (issue: #110541)
  • ESQL: change from quoting from backtick to quote #108395
  • ESQL: make named params objects truly per request #110046 (issue: #110028)
  • ES|QL: Fix DISSECT that overwrites input #110201 (issue: #110184)
  • ES|QL: limit query depth to 500 levels #108089 (issue: #107752)
  • ES|QL: reduce max expression depth to 400 #111186 (issue: #109846)
  • Fix ST_DISTANCE Lucene push-down for complex predicates #110391 (issue: #110349)
  • Fix ClassCastException with MV_EXPAND on missing field #110096 (issue: #109974)
  • Fix bug in union-types with type-casting in grouping key of STATS #110476 (issues: #109922, #110477)
  • Fix for union-types for multiple columns with the same name #110793 (issues: #110490, #109916)
  • [ESQL] Count_distinct(_source) should return a 400 #110824
  • [ESQL] Fix parsing of large magnitude negative numbers #110665 (issue: #104323)
  • [ESQL] Migrate SimplifyComparisonArithmetics optimization #109256 (issues: #108388, #108743)
Engine
  • Async close of IndexShard #108145
Highlighting
  • Fix issue with returning incomplete fragment for plain highlighter #110707
ILM+SLM
  • Allow read_slm to call GET /_slm/status #108333
Indices APIs
  • Create a new NodeRequest for every NodesDataTiersUsageTransport use #108379
Infra/Core
  • Add a cluster listener to fix missing node features after upgrading from a version prior to 8.13 #110710 (issue: #109254)
  • Add bounds checking to parsing ISO8601 timezone offset values #108672
  • Fix native preallocate to actually run #110851
  • Ignore additional cpu.stat fields #108019 (issue: #107983)
  • Specify parse index when error occurs on multiple datetime parses #108607
Infra/Metrics
  • Provide document size reporter with MapperService #109794
Infra/Node Lifecycle
  • Expose ?master_timeout on get-shutdown API #108886
  • Fix serialization of put-shutdown request #107862 (issue: #107857)
  • Support wait indefinitely for search tasks to complete on node shutdown #107426
Infra/REST API
  • Add some missing timeout params to REST API specs #108761
  • Consider error_trace supported by all endpoints #109613 (issue: #109612)
Ingest Node
  • Fix Dissect with leading non-ascii characters #111184
  • Fix enrich policy runner exception handling on empty segments response #111290
  • GeoIP tasks should wait longer for master #108410
  • Removing the use of Stream::peek from GeoIpDownloader::cleanDatabases #110666
  • Simulate should succeed if ignore_missing_pipeline #108106 (issue: #107314)
Machine Learning
  • Allow deletion of the ELSER inference service when reference in ingest #108146
  • Avoid InferenceRunner deadlock #109551
  • Correctly handle duplicate model ids for the _cat trained models api and usage statistics #109126
  • Do not use global ordinals strategy if the leaf reader context cannot be obtained #108459
  • Fix NPE in trained model assignment updater #108942
  • Fix serialising inference delete response #109384
  • Fix "stack use after scope" memory error #2673
  • Fix trailing slash in ml.get_categories specification #110146
  • Handle any exception thrown by inference #2680
  • Increase response size limit for batched requests #110112
  • Offload request to generic threadpool #109104 (issue: #109100)
  • Propagate accurate deployment timeout #109534 (issue: #109407)
  • Refactor TextEmbeddingResults to use primitives rather than objects #108161
  • Require question to be non-null in QuestionAnsweringConfig #107972
  • Start Trained Model Deployment API request query params now override body params #109487
  • Suppress deprecation warnings from ingest pipelines when deleting trained model #108679 (issue: #105004)
  • Use default translog durability on AD results index #108999
  • Use the multi node routing action for internal inference services #109358
  • [Inference API] Extract optional long instead of integer in RateLimitSettings#of #108602
  • [Inference API] Fix serialization for inference delete endpoint response #110431
  • [Inference API] Replace model_id with inference_id in inference API except when stored #111366
Mapping
  • Fix off by one error when handling null values in range fields #107977 (issue: #107282)
  • Limit number of synonym rules that can be created #109981 (issue: #108785)
  • Propagate mapper builder context flags across nested mapper builder context creation #109963
  • DenseVectorFieldMapper fixed typo #108065
Network
  • Use proper executor for failing requests when connection closes #109236 (issue: #109225)
  • NoSuchRemoteClusterException should not be thrown when a remote is configured #107435 (issue: #107381)
Packaging
  • Adding override for lintian false positive on libvec.so #108521 (issue: #108514)
Ranking
  • Fix score count validation in reranker response #111424 (issue: #111202)
Rollup
  • Fix trailing slash in two rollup specifications #110176
Search
  • Adding score from RankDoc to SearchHit #108870
  • Better handling of multiple rescorers clauses with LTR #109071
  • Correct query profiling for conjunctions #108122 (issue: #108116)
  • Fix DecayFunctions' toString #107415 (issue: #100870)
  • Fix leak in collapsing search results #110927
  • Fork freeing search/scroll contexts to GENERIC pool #109481
Security
  • Add permission to secure access to certain config files #107827
  • Add permission to secure access to certain config files specified by settings #108895
  • Fix trappy timeouts in security settings APIs #109233
Snapshot/Restore
  • Stricter failure handling in multi-repo get-snapshots request handling #107191
TSDB
  • Sort time series indices by time range in GetDataStreams API #107967 (issue: #102088)
Transform
Vector Search
  • Ensure vector similarity correctly limits inner_hits returned for nested kNN #111363 (issue: #111093)
  • Ensure we return non-negative scores when scoring scalar dot-products #108522
Watcher
  • Avoiding running watch jobs in TickerScheduleTriggerEngine if it is paused #110061 (issue: #105933)

Deprecations

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ILM+SLM
  • Deprecate using slm privileges to access ilm #110540
Infra/Settings
  • ParseHeapRatioOrDeprecatedByteSizeValue for indices.breaker.total.limit #110236
Machine Learning
  • Deprecate text_expansion and weighted_tokens queries #109880

Enhancements

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Aggregations
  • Aggs: Scripted metric allow list #109444
  • Enable inter-segment concurrency for low cardinality numeric terms aggs #108306
  • Increase size of big arrays only when there is an actual value in the aggregators #107764
  • Increase size of big arrays only when there is an actual value in the aggregators (Analytics module) #107813
  • Optimise BinaryRangeAggregator for single value fields #108016
  • Optimise cardinality aggregations for single value fields #107892
  • Optimise composite aggregations for single value fields #107897
  • Optimise few metric aggregations for single value fields #107832
  • Optimise histogram aggregations for single value fields #107893
  • Optimise multiterms aggregation for single value fields #107937
  • Optimise terms aggregations for single value fields #107930
  • Speed up collecting zero document string terms #110922
Allocation
  • Log shard movements #105829
  • Support effective watermark thresholds in node stats API #107244 (issue: #106676)
Application
  • Add Create or update query rule API call #109042
  • Rename rule query and add support for multiple rulesets #108831
  • Support multiple associated groups for TopN #108409 (issue: #108018)
  • [Connector API] Change UpdateConnectorFiltering API to have better defaults #108612
Authentication
  • Expose API Key cache metrics #109078
Authorization
  • Cluster state role mapper file settings service #107886
  • Cluster-state based Security role mapper #107410
  • Introduce role description field #107088
  • [Osquery] Extend kibana_system role with an access to new osquery_manager index #108849
Data streams
  • Add metrics@custom component template to metrics-- index template #109540 (issue: #109475)
  • Apm-data: enable plugin by default #108860
  • Apm-data: ignore malformed fields, and too many dynamic fields #108444
  • Apm-data: improve default pipeline performance #108396 (issue: #108290)
  • Apm-data: improve indexing resilience #108227
  • Apm-data: increase priority above Fleet templates #108885
  • Apm-data: increase version for templates #108340
  • Apm-data: set codec: best_compression for logs-apm.* data streams #108862
  • Remove default_field: message from metrics index templates #110651
Distributed
  • Add wait_for_completion parameter to delete snapshot request #109462 (issue: #101300)
  • Improve mechanism for extracting the result of a PlainActionFuture #110019 (issue: #108125)
ES|QL
  • Add BlockHash for 3 BytesRefs #108165
  • Allow LuceneSourceOperator to early terminate #108820
  • Check if CsvTests required capabilities exist #108684
  • ESQL: Add aggregates node level reduction #107876
  • ESQL: Add more time span units #108300
  • ESQL: Implement LOOKUP, an "inline" enrich #107987 (issue: #107306)
  • ESQL: Renamed TopList to Top #110347
  • ESQL: Union Types Support #107545 (issue: #100603)
  • ESQL: add REPEAT string function #109220
  • ES|QL Add primitive float support to the Compute Engine #109746 (issue: #109178)
  • ES|QL Add primitive float variants of all aggregators to the compute engine #109781
  • ES|QL: vectorize eval #109332
  • Optimize ST_DISTANCE filtering with Lucene circle intersection query #110102 (issue: #109972)
  • Optimize for single value in ordinals grouping #108118
  • Rewrite away type converting functions that do not convert types #108713 (issue: #107716)
  • ST_DISTANCE Function #108764 (issue: #108212)
  • Support metrics counter types in ESQL #107877
  • [ESQL] CBRT function #108574
  • [ES|QL] Convert string to datetime when the other size of an arithmetic operator is date_period or time_duration #108455
  • [ES|QL] Support Named and Positional Parameters in EsqlQueryRequest #108421 (issue: #107029)
  • [ES|QL] weighted_avg #109993
Engine
  • Drop shards close timeout when stopping node. #107978 (issue: #107938)
  • Update translog writeLocation for flushListener after commit #109603
Geo
  • Optimize GeoBounds and GeoCentroid aggregations for single value fields #107663
Health
  • Log details of non-green indicators in HealthPeriodicLogger #108266
Highlighting
  • Unified Highlighter to support matched_fields #107640 (issue: #5172)
Infra/Core
  • Add allocation explain output for THROTTLING shards #109563
  • Create custom parser for ISO-8601 datetimes #106486 (issue: #102063)
  • Extend ISO8601 datetime parser to specify forbidden fields, allowing it to be used on more formats #108606
  • add Elastic-internal stable bridge api for use by Logstash #108171
Infra/Metrics
  • Add auto-sharding APM metrics #107593
  • Add request metric to RestController to track success/failure (by status code) #109957
  • Allow RA metrics to be reported upon parsing completed or accumulated #108726
  • Provide the DocumentSizeReporter with index mode #108947
  • Return noop instance DocSizeObserver for updates with scripts #108856
Ingest Node
  • Add continent_code support to the geoip processor #108780 (issue: #85820)
  • Add support for the Connection Type database to the geoip processor #108683
  • Add support for the Domain database to the geoip processor #108639
  • Add support for the ISP database to the geoip processor #108651
  • Adding hits_time_in_millis and misses_time_in_millis to enrich cache stats #107579
  • Adding user_type support for the enterprise database for the geoip processor #108687
  • Adding human readable times to geoip stats #107647
  • Include doc size info in ingest stats #107240 (issue: #106386)
  • Make ingest byte stat names more descriptive #108786
  • Return ingest byte stats even when 0-valued #108796
  • Test pipeline run after reroute #108693
Logs
  • Introduce a node setting controlling the activation of the logs index mode in logs@settings component template #109025 (issue: #108762)
  • Support index sorting with nested fields #110251 (issue: #107349)
Machine Learning
  • Add Anthropic messages integration to Inference API #109893
  • Add sparse_vector query #108254
  • Add model download progress to the download task status #107676
  • Add rate limiting support for the Inference API #107706
  • Add the rerank task to the Elasticsearch internal inference service #108452
  • Default the HF service to cosine similarity #109967
  • GA the update trained model action #108868
  • Handle the "JSON memory allocator bytes" field #109653
  • Inference Processor: skip inference when all fields are missing #108131
  • Log 'No statistics at.. ' message as a warning #2684
  • Optimise frequent item sets aggregation for single value fields #108130
  • Sentence Chunker #110334
  • [Inference API] Add Amazon Bedrock Support to Inference API #110248
  • [Inference API] Add Mistral Embeddings Support to Inference API #109194
  • [Inference API] Check for related pipelines on delete inference endpoint #109123
Mapping
  • Add ignored field values to synthetic source #107567
  • Apply FLS to the contents of IgnoredSourceFieldMapper #109931
  • Binary field enables doc values by default for index mode with synthe… #107739 (issue: #107554)
  • Feature/annotated text store defaults #107922 (issue: #107734)
  • Handle ignore_above in synthetic source for flattened fields #110214
  • Opt in keyword field into fallback synthetic source if needed #110016
  • Opt in number fields into fallback synthetic source when doc values a… #110160
  • Reflect latest changes in synthetic source documentation #109501
  • Store source for fields in objects with dynamic override #108911
  • Store source for nested objects #108818
  • Support synthetic source for geo_point when ignore_malformed is used #109651
  • Support synthetic source for scaled_float and unsigned_long when ignore_malformed is used #109506
  • Support synthetic source for date fields when ignore_malformed is used #109410
  • Support synthetic source together with ignore_malformed in histogram fields #109882
  • Track source for arrays of objects #108417 (issue: #90708)
  • Track synthetic source for disabled objects #108051
Network
  • Detect long-running tasks on network threads #109204
Ranking
  • Enabling profiling for RankBuilders and adding tests for RRF #109470
Relevance
  • [Query Rules] Add API calls to get or delete individual query rules within a ruleset #109554
  • [Query Rules] Require Enterprise License for Query Rules #109634
Search
  • Add AVX-512 optimised vector distance functions for int7 on x64 #109084
  • Add SparseVectorStats #108793
  • Add _name support for top level knn clauses #107645 (issues: #106254, #107448)
  • Add a SIMD (AVX2) optimised vector distance function for int7 on x64 #108088
  • Add min/max range of the event.ingested field to cluster state for searchable snapshots #106252
  • Add per-field KNN vector format to Index Segments API #107216
  • Add support for hiragana_uppercase & katakana_uppercase token filters in kuromoji analysis plugin #106553
  • Adding support for explain in rrf #108682
  • Allow rescorer with field collapsing #107779 (issue: #27243)
  • Limit the value in prefix query #108537 (issue: #108486)
  • Make dense vector field type updatable #106591
  • Multivalue Sparse Vector Support #109007
Security
  • Add bulk delete roles API #110383
  • Remote cluster - API key security model - cluster privileges #107493
Snapshot/Restore
  • Denser in-memory representation of ShardBlobsToDelete #109848
  • Log repo UUID at generation/registration time #109672
  • Make repository analysis API available to non-operators #110179 (issue: #100318)
  • Track RequestedRangeNotSatisfiedException separately in S3 Metrics #109657
Stats
  • DocsStats: Add human readable bytesize #109720
TSDB
  • Optimise time_series aggregation for single value fields #107990
  • Support ignore_above on keyword dimensions #110337
Vector Search
  • Adding hamming distance function to painless for dense_vector fields #109359
  • Support k parameter for knn query #110233 (issue: #108473)

New features

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Aggregations
  • Opt scripted_metric out of parallelization #109597
Application
  • [Connector API] Add claim sync job endpoint #109480
ES|QL
  • ESQL: Add ip_prefix function #109070 (issue: #99064)
  • ESQL: Introduce a casting operator, :: #107409
  • ESQL: top_list aggregation #109386 (issue: #109213)
  • ESQL: add Arrow dataframes output format #109873
  • Reapply "ESQL: Expose "_ignored" metadata field" #108871
Infra/REST API
  • Add a capabilities API to check node and cluster capabilities #106820
Ingest Node
  • Directly download commercial ip geolocation databases from providers #110844
  • Mark the Redact processor as Generally Available #110395
Logs
Machine Learning
  • Add support for Azure AI Studio embeddings and completions to the inference service. #108472
Mapping
  • Add semantic_text field type and semantic query #110338
  • Add generic fallback implementation for synthetic source #108222
  • Add synthetic source support for geo_shape via fallback implementation #108881
  • Add synthetic source support for binary fields #107549
  • Enable fallback synthetic source by default #109370 (issue: #106460)
  • Enable fallback synthetic source for point and shape #109312
  • Enable fallback synthetic source for token_count #109044
  • Implement synthetic source support for annotated text field #107735
  • Implement synthetic source support for range fields #107081
  • Support arrays in fallback synthetic source implementation #108878
  • Support synthetic source for aggregate_metric_double when ignore_malf… #108746
Ranking
  • Add text similarity reranker retriever #109813
Relevance
Search
  • Add new int4 quantization to dense_vector #109317
  • Adding RankFeature search phase implementation #108538
  • Adding aggregations support for the _ignored field #101373 (issue: #59946)
  • Update Lucene version to 9.11 #109219
Security
Transform
  • Introduce _transform/_node_stats API #107279
Vector Search
  • Adds new bit element_type for dense_vectors #110059

Upgrades

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Infra/Plugins
Ingest Node
  • Bump Tika dependency to 2.9.2 #108144
Network
Search
Security
  • Upgrade bouncy castle (non-fips) to 1.78.1 #108223
Snapshot/Restore
  • Bump jackson version in modules:repository-azure #109717
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