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Elasticsearch version 8.8.0

Also see Breaking changes in 8.8.

Bug fixes

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)

Deprecations

Allocation

Deprecate cluster.routing.allocation.type #94066

Enhancements

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 features

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

Text Expansion Query #93694

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

Upgrades

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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