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Elasticsearch version 8.1.0

Also see Breaking changes in 8.1.

Known issues

Parsing a request when the last element in an array is filtered out (for instance using _source_includes) fails. This is due to a bug in Jackson parser. Fixed in Elasticsearch 8.6.1 (#91456)

Breaking changes

Geo

Fields API should return normalize geometries #80649 (issues: #79232, #63739)

Bug fixes

Aggregations

Reenable BooleanTermsIT #83421 (issue: #83351)
backward compatibility with version 7.17.0 #83715
ip prefix bucket reduction #83637
reduce float and half-float values to their stored precision #83213

Allocation

Fix updateMinNode condition #80403 (issue: #41194)
Make *.routing.allocation.* list-based setting #80420 (issue: #77773)
Permit metadata updates on flood-stage-blocked indices #81781
Reroute after cluster recovery #82856 (issue: #82456)

Authorization

Capture anonymous roles when creating API keys #81427 (issue: #81024)
Extend fleet-server service account privileges #82600

Autoscaling

Fix autoscaling of follower data streams #83302 (issue: #82857)

Client

Fix for self-suppression in REST client #83568 (issue: #42223)

Distributed

[GCE Discovery] Correctly handle large zones with 500 or more instances #83785 (issue: #83783)

Engine

Fork to WRITE thread when failing shard #84606 (issue: #84602)

Geo

Handle bounds properly when grid tiles crosses the dateline #83348 (issue: #83299)
GeometryNormalizer should not fail if it cannot compute signed area #84051 (issue: #83946)

ILM+SLM

Fix PolicyStepsRegistry's cachedSteps null handling #84588

Indices APIs

Allow removing unreferenced composable data stream templates #84376 (issues: #84171, #84188)
Simplify and speed up ExecutorSelector #83514 (issue: #82450)

Infra/Core

Always re-run Feature migrations which have encountered errors #83918 (issue: #83917)
Copy trace.id in threadcontext stash #83218
Preserve context in ResultDeduplicator #84038 (issue: #84036)
Registration of SystemIndexMigrationTask named xcontent objects #84192 (issue: #84115)
Update system index mappings if _meta is null #83896 (issue: #83890)

Infra/REST API

Do not allow safelisted media types on Content-Type #83448

Infra/Scripting

Fix duplicated allow lists upon script engine creation #82820 (issue: #82778)
Fix plumbing in double and keyword runtime fields for the scripting fields API #83392

Ingest

Fix GeoIpDownloader startup during rolling upgrade #84000
Short circuit date patterns after first match #83764

Machine Learning

Allow autoscaling to work when vertical scaling is possible #84242 (issue: #84198)
Correctly capture min stats for inference.ingest_processors in ML usage #82352
Fail queued inference requests with cause if the process crashes #81584
Fix NLP tokenization never_split handling around punctuation #82982
Fix ZeroShotClassificationConfig update mixing fields #82848
Fix bug where initial scale from 0→1 could scale too high #84244
Fix submit after shutdown in process worker service #83645 (issue: #83633)
Fixes categorize_text parameter validation to be parse order independent #82628 (issue: #82629)
Record node shutdown start time for each node #84355
Register the named X-content parser for snapshot upgrade params #84420 (issue: #84419)
Retry anomaly detection job recovery during relocation #83456
Return zxx for lang_ident_model_1 if no valid text is found for language identification #82746 (issue: #81933)
Text structure finder caps exclude lines pattern at 1000 characters #84236 (issue: #83434)
Validate vocabulary on model deployment #81548 (issue: #81470)
Wait for model process to stop in stop deployment #83644

Mapping

Add support for sub-fields to search_as_you_type fields #82430 (issue: #56326)
Better exception message for MappingParser.parse #80696
Completion field to support multiple completion multi-fields #83595 (issue: #83534)

Network

Throw NoSeedNodeLeftException on proxy failure #80961 (issue: #80898)

Packaging

Add log4j-slf4j-impl to repository-azure #83661 (issue: #83652)
Restart ES after keystore upgrade in postinst #84224 (issue: #82433)

Recovery

Add missing indices.recovery.internal_action_retry_timeout to list of settings #83354
Add missing max overcommit factor to list of (dynamic) settings #83350

SQL

Fix txt format for empty result sets #83376

Search

Avoid eagerly loading StoredFieldsReader in fetch phase #83693 (issue: #82777)
Do not deserialise the document when not needed in the fields fetch phase #84184
Returns valid PIT when no index matched #83424

Security

Add validation for API key role descriptors #82049 (issue: #67311)

Snapshot/Restore

Adjust LinuxFileSystemNatives.allocatedSizeInBytes for aarch64 architectures #81376 (issues: #80437, #81362)
Distinguish "missing repository" from "missing repository plugin" #82457 (issue: #81758)
Fix DirectBlobContainerIndexInput cloning method #84341 (issue: #84238)
Move get snapshots serialization to management pool #83215
Preserve context in snapshotDeletionListeners #84089 (issue: #84036)

TSDB

Fix time series timestamp meta missing #80695

Transform

Fix NPE in transform version check #81756
Fix condition on which the transform stops processing buckets #82852
Prevent stopping of transforms due to threadpool limitation #81912 (issue: #81796)

Watcher

Tolerate empty types array in Watch definitions #83524 (issue: #83235)

Deprecations

CRUD

Bulk actions JSON must be well-formed #78876 (issue: #43774)

Cluster Coordination

Remove last few mentions of Zen discovery #80410

Search

Deprecate the indices.query.bool.max_clause_count node setting #81525 (issue: #46433)

SQL

Deprecate index_include_frozen request parameter #83943 (issue: #81939)

Enhancements

Aggregations

Add an aggregator for IPv4 and IPv6 subnets #82410
Fail shards early when we can detect a type missmatch #79869 (issue: #72276)
Optimize significant_text aggregation to only parse the field it requires from _source #79651

Allocation

Identify other node in SameShardAllocDec message #82890 (issue: #80767)
Make AllocationService#adaptAutoExpandReplicas Faster #83092
Speed up same host check #80767

Analysis

Expose Japanese completion filter to kuromoji analysis plugin #81858

Authentication

Enable run_as for all authentication schemes #79809
Return API key name in _authentication response #78946 (issue: #70306)

Authorization

Avoid loading authorized indices when requested indices are all concrete names #81237
Optimize DLS bitset building for matchAll query #81030 (issue: #80904)

Cluster Coordination

Add detail to slow cluster state warning message #83221
Batch Index Settings Update Requests #82896 (issue: #79866)
Improve node-join task descriptions #80090
Make PeerFinder log messages happier #83222
More compact serialization of metadata #82608 (issue: #77466)
Paginate persisted cluster state #78875
Reduce verbosity-increase timeout to 3 minutes #81118
Use network recycler for publications #80650 (issue: #80111)

Data streams

Defer reroute when autocreating datastream #82412 (issue: #82159)

ILM+SLM

Expose the index age in ILM explain output #81273 (issue: #64429)

Indices APIs

Batch auto create index cluster state updates #82159
Expose features option in Get Index API #83083 (issue: #82948)
Expose index health and status to the _stats API #81954 (issue: #80413)
Force merge REST API support wait_for_completion #80463 (issues: #80129, #80129)

Infra/Circuit Breakers

Allow dynamically changing the use_real_memory setting #78288 (issue: #77324)

Infra/Core

Use VarHandles for number conversions #80367 (issue: #78823)
Use VarHandles in ByteUtils #80442 (issue: #78823)
FilterPathBasedFilter support match fieldname with dot #83178 (issues: #83148, #83152)

Infra/REST API

Allow for customised content-type validation #80906 (issue: #80482)
Update YAML REST tests to check for product header on all responses #83290

Infra/Scripting

Add $ syntax as a shortcut for field in Painless #80518
Add BinaryDocValuesField to replace BytesRef (ScriptDocValues) #79760
Add a geo point field for the scripting fields api #81395
Add date fields to the scripting fields api #81272
Add half float mapping to the scripting fields API #82294
Add scaled float to the scripting fields API #82275
Add support for GeoShape to the scripting fields API #81617
Fields API for IP mapped type #81396
Fields API for byte, double, float, integer, long, short #81126 (issue: #79105)
Fields API for flattened mapped type #82590
Fields API for x-pack constant_keyword #82292
Fields API for x-pack version, doc version, seq no, mumur3 #81476
Improve support for joda datetime to java datetime in Painless #83099
Keyword fields API support #81266
Make wildcard accessible from the scripting field API #82763
Ordinal field data plumbing #80970 (issue: #79105)
Support boolean fields in Fields API #80043 (issue: #79105)
Time series compile and cache evict metrics #79078 (issue: #62899)

Infra/Settings

Optimize duplicated code block in MetadataUpdateSettingsService #82048

Machine Learning

Add ability to update the truncation option at inference #80267
Add error counts to trained model stats #82705
Add latest search interval to datafeed stats #82620 (issue: #82405)
Adds new MPNet tokenization for NLP models #82234
Force delete trained models #80595
Improve error message on starting scrolling datafeed with no matching indices #81069 (issue: #81013)
Report thread settings per node for trained model deployments #81723 (issue: #81149)
Set default value of 30 days for model prune window #81377
Track token positions and use source string to tag NER entities #81275
Warn when creating job with an unusual bucket span #82145 (issue: #81645)

Mapping

Allow doc-values only search on geo_point fields #83395
Implement all queries on doc-values only keyword fields #83404
Optimize source filtering in SourceFieldMapper #81970 (issues: #77154, #81575)

Monitoring

Add Enterprise Search monitoring index templates #82743
Add beats_stats.metrics.apm-server.sampling.tail to Stack Monitoring templates #82401

Network

Report close connection exceptions at INFO #81768 (issues: #51612, #66473)
Serialize outbound messages on netty buffers #80111
Track histogram of transport handling times #80581 (issue: #80428)

Recovery

Adjust indices.recovery.max_bytes_per_sec according to external settings #82819

SQL

Compress Cursors #83591
Extend Tableau connector to reconnect with catalog #81321

Search

Add scripted_metric agg context to unsigned_long #64422 (issue: #64347)
Add field usage support for vectors #80608
Allow doc-values only search on boolean fields #82925 (issues: #82409, #81210, #52728)
Allow doc-values only search on date types #82602 (issues: #82409, #81210, #52728)
Allow doc-values only search on ip fields #82929 (issues: #82409, #81210, #52728)
Allow doc-values only search on keyword fields #82846 (issues: #82409, #81210, #52728)
Allow doc-values only search on number types #82409 (issues: #81210, #52728)
Rewrite match and match_phrase queries to term queries on keyword fields #82612 (issue: #82515)
Short cut if reader has point values #80268
Support combining _shards preference param with <custom-string> #80024 (issue: #80021)

Security

Activate user profile API #82400
Add an initial ProfileService for user profiles #81899
Add new system index for user profile documents #81355
Add update user profile data API #82772
Add user profile API for get profile by UID #81910
Update Kibana system user privileges #82781

Snapshot/Restore

Add Linux x86-64bits native method to retrieve the number of allocated bytes on disk for a file #80437 (issue: #79698)

Stats

Add index pressure stats in cluster stats #80303 (issue: #79788)
Optimize getIndices in IndicesSegmentResponse #80064
Speed up MappingStats Computation on Coordinating Node #82830

TSDB

Add _tsid field to time_series indices #80276
Make time boundaries settings required in TSDB indices #81146

Transform

Introduce deduce_mappings transform setting #82256 (issue: #82559)
Make it possible to clear retention policy on an existing transform #82703 (issue: #82560)
Report transforms without config as erroneous #81141 (issue: #80955)

New features

Authentication

Initial version of JWT Realm #82175
Introduce domain setting to associate realms #81968

Distributed

Add desired nodes API #82975

Geo

New GeoHexGrid aggregation #82924

Health

Model for the new health reporting api #83398

TSDB

Handle fields.with.dots in routing_path #83148

Transform

Add transform reset API #79828 (issue: #75768)

Upgrades

Geo

Update vector tiles google protobuf to 3.16.1 #83402

Network

Upgrade to Netty 4.1.73 #82844

Packaging

Bump bundled JDK to 17.0.2+8 #83243 (issue: #83242)

Security

Upgrade jANSI dependency to 2.4.0 #83566

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https://www.elastic.co/guide/en/elasticsearch/reference/8.17/release-notes-8.1.0.html