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Elasticsearch version 8.8.0edit

Also see Breaking changes in 8.8.

Bug fixesedit

Aggregations
  • Merge two histograms using the higher number of digits among all histograms #93704 (issue: #92822)
Allocation
  • Avoid copying during iteration of all shards in routing table #94417
  • Avoid duplicate application of RoutingTable diff #94379
  • Balance priorities during reconciliation #95454
  • Fix RebalanceOnlyWhenActiveAllocationDecider #96025
  • Streamline AsyncShardFetch#getNumberOfInFlightFetches #93632 (issue: #93631)
Application
  • Check if an analytics event data stream exists before installing pipeline #95621
  • [Behavioral Analytics] Use a client with ent-search origin in the BulkProcessorFactory #95614
Authorization
  • Fix role transformation to include missing properties #94714
  • [Fleet] Add read privileges to profiling-* for symbolization support #95596
CRUD
  • Avoid null Location in post write refresh #95229
Cluster Coordination
  • Read register current term asynchronously in StoreHeartbeatService #95351
DLM
  • Remove rollover cluster setting validator #94447
  • [DLM] Fix the new endpoint rest-api specification #95665
Data streams
  • Allow deletion of component templates that are specified in the ignore_missing_component_templates array #95527
  • Fix searching a filtered and unfiltered data stream alias #95865 (issue: #95786)
Distributed
  • Check shard availability before including in stats #96015 (issues: #96000, #87001)
  • Fix GetPipelineResponse equality #93695
Engine
  • Ensure refresh to return the latest commit generation #94249
Geo
  • Adjust BoundedGeoHexGridTiler#FACTOR to prevent missing hits #96088 (issue: #96057)
  • Fix bug where geo_line does not respect sort_order #94734 (issue: #94733)
ILM+SLM
  • Retry downsample ILM action using a new target index #94965 (issue: #93580)
  • Strip disallowed chars from generated snapshot name #95767 (issue: #95593)
  • [ILM] Fix the migrate to tiers service and migrate action tiers configuration #95934
Infra/Core
  • Fix race condition in NodeEnvironment.close() #94677 (issue: #94672)
  • Use double wildcards for filtered excludes properly #94195 (issue: #92632)
Infra/REST API
  • Add level parameter validation in REST layer #94136 (issue: #93981)
Infra/Scripting
  • Allow low level paging in LeafDocLookup #93711
  • Revert usage of SafeMustacheFactory in CustomMustacheFactory #95557
Ingest Node
  • Fix Grok.match() with offset and suffix pattern #95003 (issue: #95002)
  • Fix bug in verbose simulations of the ingest pipeline API #95232
Machine Learning
  • Avoid expensive source parsing by using doc values when querying model definition meta fields #95590
Mapping
  • Longer timeout for mapping update during resize #95221
Network
  • Fix RecyclerBytesStreamOutput corrupting when ending write on page boundary #95114
  • Fix maximum seek limit RecyclerBytesStreamOutput #95133
Ranking
  • Fix versioning for tests cases using a randomly generated rank builder #95514
Search
  • Fix _terms_enum display values #94080 (issue: #94041)
  • Support ignore malformed in boolean fields #93239 (issue: #89542)
  • Support search template api explain query string argument #94832 (issue: #83363)
Snapshot/Restore
  • Cancel cold cache prewarming tasks if store is closing #95891 (issue: #95504)
  • Fix 0 default value for repo snapshot speed #95854 (issue: #95561)
  • Fix Azure InputStream#read method #96034
  • Stop sorting indices in get-snapshots API #94890
Transform
  • Call listener in order to prevent the request from hanging #96221
  • Do not fail upon ResourceAlreadyExistsException during destination index creation #96274 (issue: #95310)
  • Fix privileges check failures by adding allow_restricted_indices flag #95187
  • Secondary credentials used with transforms should only require source and destination index privileges, not transform privileges #94420
  • Use monotonic time in TransformScheduler #95456 (issue: #95445)

Deprecationsedit

Allocation
  • Deprecate cluster.routing.allocation.type #94066

Enhancementsedit

Aggregations
  • Add keyed parameter to filters agg, allowing the user to get non-keyed buckets of named filters agg #89256 (issue: #83957)
  • Add global ordinal info to stats APIs #94500
  • Don’t create many Rounding.Prepared instances when checking for empty buckets in date_histogram aggregator. #94649
Analysis
  • Add origin of synonym rules to exception message #93702
Application
  • Behavioral Analytics event ingest tuning #95405
  • [Behavioral Analytics] Add geo ip and user agent to events #95433
  • [Behavioral analytics] Implement search filters into events #95212
Authentication
  • Do not fail node if SAML HTTP metadata is unavailable #92810 (issue: #37608)
  • Finer control over authentication metadata serialization #93726
Authorization
  • Add permissions to kibana_system for TI package transforms to support IOC expiration #94506 (issue: #94505)
  • Ensure checking indices privileges works with nested-limited-role #95170
Cluster Coordination
  • Improve master service batching queues #92021 (issue: #81626)
DLM
  • Adding origination date to DLM #95113
Engine
  • Increase the merge factor to 32 for time-based data #94134
  • Reduce the likelihood of writing small segments due to an oversize translog #93524 (issue: #75611)
  • Sort segments on timestamp in read only engine #93576
  • Use LogByteSizeMergePolicy instead of TieredMergePolicy for time-based data #92684
  • Use mmap for temporary files #93595
Geo
  • Allow docvalues-only search on geo_shape #94396
  • Support for store parameter in geo_shape field #94418 (issue: #83655)
Highlighting
  • Use storedFieldsSpec to load stored fields for highlighting #91841
ILM+SLM
  • Implicitly rollover data streams / aliases based on max_primary_shard_docs #94065 (issue: #87246)
  • Sort ILM explain output by natural index name #94879 (issue: #94768)
Indices APIs
  • Adding initial public and internal serverless scopes to data management rest handlers #93990
  • Servlerless API protection with annotations #93607
Infra/Core
  • Allow preserving specific headers on thread context stash #94680
Infra/Plugins
  • Improve module/plugin loading logging message. #93952 (issue: #93881)
Infra/Transport API
  • Add transport_version to node info JSON #94669
Ingest Node
  • Add reroute processor #76511
  • Introduce redirect method on IngestDocument #94000 (issue: #83653)
  • [Ingest Processor] Add ignore_missing param to the uri_parts ingest processor #95068
Machine Learning
  • Add _meta field to data frame analytics config #94529
  • Add embedding_size to text embedding config #95176
  • Include model definition install status for Pytorch models #95271
  • Integrate ELSER model download into put trained model API #95281
  • Start, stop and infer of a trained model can now optionally use a deployment ID that is different to the model ID #95168
  • [ML] Get trained model stats by deployment id or model id #95440
Mapping
  • Cut over from Field to StringField when applicable #94540
  • Enable _terms_enum on ip fields #94322 (issue: #89933)
  • Enable synthetic source for malformed booleans #94121
  • Index sequence numbers via a single Lucene field #94504
  • Use a combined field to index terms and doc values on keyword fields #93579
Monitoring
  • Add event_loop_utilization Kibana stats to the monitoring index templates #95388
Network
  • Add request/response body logging to HTTP tracer #93133
  • Avoid deserializing responses in proxy node #93799
  • Report transport message size per action #94543 (issue: #88151)
  • Retain underlying error on proxy mode connection failure #94998
SQL
  • Add WildcardLike/Pattern to QL #95357
Search
  • Adding initial public and internal serverless scopes to Search team REST handlers #94035
  • Enable _terms_enum on version fields #93839 (issue: #83403)
  • Introduce DocumentParsingException #92646 (issue: #85083)
  • Leverage Weight#count when size is set to 0 #94858
  • Make SourceProvider using stored fields segment-thread-safe #95082
  • Shortcut total hit count when terminate_after is used #94889
  • [Profiling] Map stack frames more efficiently #94327
  • [Profiling] Parallelize response handling #93960
Security
  • Fleet: Add new mappings for .fleet-actions signing #93802
Snapshot/Restore
  • Add register analysis to repo analysis API #93955
  • Add snapshot activity in cluster stats #93680
  • Add support for custom endpoints in the Azure repository #94576 (issue: #94537)
  • Failed tasks proactively cancel children tasks #92588 (issue: #90353)
TSDB
  • Support position time_series_metric on geo_point fields #93946
Transform
  • Add delete_destination_index parameter to the Delete Transform API #94162
  • Allow specifying destination index aliases in the Transform’s dest config #94943
  • Expose authorization failure as transform health issue #94724
Vector Search
  • Increase max number of vector dims to 2048 #95257
Watcher
  • Add Watcher APIs for updating/retrieving settings #95342 (issue: #92991)
  • Porting watcher over to BulkProcessor2 #94133

New featuresedit

Application
  • Initial Search Application Search API with templates #95026
  • [Behavioral Analytics] Add a final_pipeline to event data streams #95198
Authentication
  • GA release of the JWT realm #95398
CRUD
  • New TransportBroadcastUnpromotableAction action #93600
DLM
  • Add new endpoints to configure data lifecycle on a data stream level #94590
  • Dlm add auto rollover condition max age #94950
  • Initial implementation for DataLifecycleService #94012
  • Introduce a _lifecycle/explain API for data stream backing indices #94621
  • Introduce the index.lifecycle.prefer_ilm setting #95423
  • [DLM] Extend the template to simulate api to support include defaults #94861
  • [DLM] Introduce default rollover cluster setting & expose it via APIs #94240
Health
  • Add new ShardsCapacity Health Indicator Service #94552
  • Add to HealthMetadata information about ShardLimits #94116
Ingest Node
  • Add license checking to the redact processor #95477
Machine Learning
Ranking
  • Add support for Reciprocal Rank Fusion to the search API #93396
Search
  • Add Enterprise Search Module #94381
  • Add new similarity field to knn clause in _search #94828
  • Add the ability to return the score of the named queries #94564 (issue: #29606)
  • Implements behavioral analytics events ingest API #95027
TSDB
  • Encode using 40, 48 and 56 bits per value #93371
  • Flattened field synthetic support #94842
  • Support flattened fields as time series dimension fields #95273

Upgradesedit

Engine
  • Upgrade to lucene-9.6-snapshot-dcc2154a1d3 #94955
Infra/Core
  • Upgrade Jackson xml to 2.15.0 #95641
Ingest Node
  • Upgrading tika to 2.7.0 #93759
Network
  • Upgrade to Netty 4.1.89 #94179
Packaging
  • Bump bundled JDK to Java 20.0.1 #95359
Search
  • Upgrade Lucene to the final 9.6.0 release #95967
  • Upgrade to lucene-9.6.0-snapshot-8a815153fbe #94635
  • Upgrade to lucene-9.6.0-snapshot-f5d1e1c787c #94494
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