[CI] RankEvalRequestTests testConcurrentEquals failing

[elasticsearchmachine]

Build Scans:

• elasticsearch-periodic #5767 / release-tests
• elasticsearch-pull-request #49557 / release-tests
• elasticsearch-pull-request #49557 / release-tests

Reproduction Line:

./gradlew ":modules:rank-eval:test" --tests "org.elasticsearch.index.rankeval.RankEvalRequestTests.testSerialization" -Dtests.seed=143504D5D0FD2FB9 -Dbuild.snapshot=false -Dtests.jvm.argline="-Dbuild.snapshot=false" -Dlicense.key=x-pack/license-tools/src/test/resources/public.key -Dtests.locale=kxv-Telu-IN -Dtests.timezone=America/Cuiaba -Druntime.java=23

Applicable branches:
main

Reproduces locally?:
N/A

Failure History:
See dashboard

Failure Message:

java.lang.AssertionError: 
Expected: <org.elasticsearch.index.rankeval.RankEvalRequest/unset>
     but: was <org.elasticsearch.index.rankeval.RankEvalRequest/unset>

Issue Reasons:

• [main] 3 consecutive failures in step release-tests
• [main] 3 failures in test testConcurrentEquals (1.2% fail rate in 248 executions)
• [main] 3 failures in step release-tests (60.0% fail rate in 5 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 consecutive failures in step release-tests
• [main] 3 failures in test testConcurrentEquals (1.2% fail rate in 248 executions)
• [main] 3 failures in step release-tests (60.0% fail rate in 5 executions)

Build Scans:

• elasticsearch-periodic #5767 / release-tests
• elasticsearch-pull-request #49557 / release-tests
• elasticsearch-pull-request #49557 / release-tests

[elasticsearchmachine]

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

[benwtrent]

Same as: #119859

labeling accordingly.

[elasticsearchmachine]

Pinging @elastic/es-data-management (Team:Data Management)