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Elasticsearch version 8.12.1

Also see Breaking changes in 8.12.

Known issues

When upgrading clusters from version 8.11.4 or earlier, if your cluster contains non-master-eligible nodes, information about the new functionality of these upgraded nodes may not be registered properly with the master node. This can lead to some new functionality added since 8.12.0 not being accessible on the upgraded cluster. If your cluster is running on ECK 2.12.1 and above, this may cause problems with finalizing the upgrade. To resolve this issue, perform a rolling restart on the non-master-eligible nodes once all Elasticsearch nodes are upgraded. This issue is fixed in 8.15.0.

Bug fixes

Allocation

Improve CANNOT_REBALANCE_CAN_ALLOCATE explanation #104904

Application

[Connector API] Fix bug in configuration validation parser #104198
[Connector API] Fix bug when triggering a sync job via API #104802
[Profiling] Query in parallel on content nodes #104600

Data streams

Data streams fix failure store delete #104281
Fix _alias/<alias> returning non-matching data streams #104145 (issue: #96589)

Downsampling

Downsampling supports date_histogram with tz #103511 (issue: #101309)

ES|QL

Avoid execute ESQL planning on refresh thread #104591
ESQL: Allow grouping by null blocks #104523
ESQL: Fix SearchStats#count(String) to count values not rows #104891 (issue: #104795)
Limit concurrent shards per node for ESQL #104832 (issue: #103666)
Reduce the number of Evals ReplaceMissingFieldWithNull creates #104586 (issue: #104583)

Infra/Resiliency

Limit nesting depth in Exception XContent #103741

Ingest Node

Better handling of async processor failures #104289 (issue: #101921)
Ingest correctly handle upsert operations and drop processors together #104585 (issue: #36746)

Machine Learning

Add retry logic for 500 and 503 errors for OpenAI #103819
Avoid possible datafeed infinite loop with filtering aggregations #104722 (issue: #104699)
[LTR] FieldValueExtrator - Checking if fetched values is empty #104314

Network

Fix lost headers with chunked responses #104808

Search

Don’t throw error for remote shards that open PIT filtered out #104288 (issue: #102596)

Snapshot/Restore

Fix deleting index during snapshot finalization #103817 (issue: #101029)

TSDB

Fix routing_path when template has multiple path_match and multi-fields #104418 (issue: #104400)

Transform

Fix bug when latest transform is used together with from parameter #104606 (issue: #104543)

Deprecations

Machine Learning

Deprecate machine learning on Intel macOS #104087

Upgrades

Search

[8.12.1] Upgrade to Lucene 9.9.2 #104761 (issue: #104617)

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https://www.elastic.co/guide/en/elasticsearch/reference/8.17/release-notes-8.12.1.html