[CI] KMeansLocalTests testKMeansNeighbors failing

[elasticsearchmachine]

Build Scans:

• elasticsearch-periodic #9001 / encryption-at-rest
• elasticsearch-pull-request #77603 / part-1
• elasticsearch-pull-request #77600 / part-1

Reproduction Line:

./gradlew ":server:test" --tests "org.elasticsearch.index.codec.vectors.cluster.KMeansLocalTests.testKMeansNeighbors" -Dtests.seed=D0419954C1258EB0 -Dtests.locale=en-001 -Dtests.timezone=Europe/Malta -Druntime.java=24

Applicable branches:
main

Reproduces locally?:
N/A

Failure History:
See dashboard

Failure Message:

java.lang.NullPointerException: Cannot read the array length because "<local7>" is null

Issue Reasons:

• [main] 3 failures in test testKMeansNeighbors (0.7% fail rate in 411 executions)
• [main] 2 failures in step part-1 (1.0% fail rate in 206 executions)
• [main] 2 failures in pipeline elasticsearch-pull-request (1.0% fail rate in 205 executions)

Note:
This issue was created using new test triage automation. Please report issues or feedback to es-delivery.

[elasticsearchmachine]

This has been muted on branch main

Mute Reasons:

• [main] 3 failures in test testKMeansNeighbors (0.7% fail rate in 411 executions)
• [main] 2 failures in step part-1 (1.0% fail rate in 206 executions)
• [main] 2 failures in pipeline elasticsearch-pull-request (1.0% fail rate in 205 executions)

Build Scans:

• elasticsearch-periodic #9001 / encryption-at-rest
• elasticsearch-pull-request #77603 / part-1
• elasticsearch-pull-request #77600 / part-1

[elasticsearchmachine]

Pinging @elastic/es-search-relevance (Team:Search Relevance)