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Elasticsearch version 8.1.1

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)

Bug fixes

Analysis

Fix min_hash configuration settings names #84753 (issue: #84578)

EQL

Clean any used memory by the sequence matcher and circuit breaker used bytes in case of exception #84451

Engine

Increase store ref before snapshotting index commit #84776

ILM+SLM

Invoke initial AsyncActionStep for newly created indices #84541 (issue: #77269)

Indices APIs

Remove existing indices/datastreams/aliases before simulating index template #84675 (issue: #84256)

Infra/Core

Fix NullPointerException in SystemIndexMetadataUpgradeService hidden alias handling #84780 (issue: #81411)
Require and preserve content type for filtered rest requests #84914 (issue: #84784)
Wrap thread creation in doPrivileged call #85180

Infra/REST API

Correctly return _type field for documents in V7 compatiblity mode #84873 (issue: #84173)

Ingest

Backport mark GeoIpDownloaderTask as completed after cancellation #84028 #85014 (issues: #84028, #84652)
CompoundProcessor should also catch exceptions when executing a processor #84838 (issue: #84781)

Machine Learning

Fix Kibana date format and similar overrides in text structure endpoint #84967
Fixes for multi-line start patterns in text structure endpoint #85066
Return all datafeeds in get anomaly detection jobs API #84759

Packaging

Remove use of Cloudflare zlib #84680

Search

Fix point visitor in DiskUsage API #84909
DotExpandingXContentParser to expose the original token location #84970

Snapshot/Restore

Don’t fail if there no symlink for AWS Web Identity Token #84697
Lookup AWS Region for STS Client from STS endpoint #84585 (issue: #83826)

Enhancements

SQL

Forward warning headers to JDBC driver #84499

Watcher

Add list of allowed domains for Watcher email action #84894 (issue: #84739)

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https://www.elastic.co/guide/en/elasticsearch/reference/8.17/release-notes-8.1.1.html