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Elasticsearch version 8.1.2

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

Authorization

Add delete privilege to kibana_system for APM #85085

Engine

Increase store ref before snapshotting index commit #84776

Infra/Core

Return empty version instead of blowing up if we cannot find it #85244
Validate index format agreement for system index descriptors #85173
Wrap thread creation in doPrivileged call #85180

Machine Learning

Do not fetch source when finding index of last state docs #85334
Fixes for multi-line start patterns in text structure endpoint #85066
Reallocate model deployments on node shutdown events #85310

Mapping

Do not fail on duplicated content field filters #85382

Search

Increase store ref before analyzing disk usage #84774
Limit concurrent shard requests in disk usage API #84900 (issue: #84779)
TransportBroadcastAction should always set response for each shard #84926

Snapshot/Restore

Fix leaking listeners bug on frozen tier #85239

Watcher

No longer require master node to install Watcher templates #85287 (issue: #85043)

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https://www.elastic.co/guide/en/elasticsearch/reference/8.17/release-notes-8.1.2.html