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Adding #132597 as known issue (8.19.0) #132683

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Merged
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Aug 11, 2025
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Adding #132597 as known issue (8.19.0) #132683

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13 changes: 13 additions & 0 deletions docs/reference/release-notes/8.19.0.asciidoc
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Expand Up @@ -539,4 +539,17 @@ Snapshot/Restore::
* Upgrade AWS Java SDK to 2.31.78 {es-pull}131050[#131050]
* Upgrade AWS SDK to v1.12.746 {es-pull}122431[#122431]

[discrete]
[[known-issues-8.19.0]]
=== Known issues
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I think we can revert this PR, because the issue doesn't occur in 8.19. By accident I forgot the remove the feature flag that controlled whether the merge optimization was enabled. This has been fixed: #128459


* An [optimization](https://github.com/elastic/elasticsearch/pull/125403) introduced in 8.19.0 contains a [bug](https://github.com/elastic/elasticsearch/pull/132597) that causes merges to fail for shrunk TSDB and LogsDB indices.

Possible *temporary* workarounds include:
* Configure the ILM policy to not perform force merges after shrinking TSDB or LogsDB indices.
* Add `-Dorg.elasticsearch.index.codec.tsdb.es819.ES819TSDBDocValuesConsumer.enableOptimizedMerge=false` as a Java system property to all data nodes in the cluster and perform a rolling restart.
* *Important:* Remove this property when upgrading to the fixed version to re-enable merge optimization. Otherwise, merges will be slower.

The bug is addressed in version 8.19.2.