[CI] CoreWithSecurityClientYamlTestSuiteIT class failing

[elasticsearchmachine]

Build Scans:

• elasticsearch-periodic-platform-support #8646 / windows-2025_checkpart4_platform-support-windows
• elasticsearch-periodic-platform-support #8640 / windows-2025_checkpart4_platform-support-windows
• elasticsearch-periodic-platform-support #8634 / windows-2025_checkpart4_platform-support-windows
• elasticsearch-pull-request #74376 / checkpart4_release-tests
• elasticsearch-pull-request #74367 / checkpart4_release-tests
• elasticsearch-pull-request #74330 / checkpart4_release-tests
• elasticsearch-pull-request #74319 / checkpart4_release-tests
• elasticsearch-pull-request #74203 / checkpart4_release-tests
• elasticsearch-pull-request #74175 / checkpart4_release-tests
• elasticsearch-pull-request #74117 / checkpart4_release-tests

Reproduction Line:

undefined

Applicable branches:
main

Reproduces locally?:
N/A

Failure History:
See dashboard

Failure Message:

undefined

Issue Reasons:

• [main] 3 consecutive failures in step windows-2025_checkpart4_platform-support-windows
• [main] 10 consecutive failures in step checkpart4_release-tests
• [main] 17 failures in class org.elasticsearch.xpack.security.CoreWithSecurityClientYamlTestSuiteIT (2.1% fail rate in 828 executions)
• [main] 3 failures in step windows-2025_checkpart4_platform-support-windows (20.0% fail rate in 15 executions)
• [main] 3 failures in step part-4 (0.8% fail rate in 383 executions)
• [main] 11 failures in step checkpart4_release-tests (91.7% fail rate in 12 executions)
• [main] 3 failures in pipeline elasticsearch-periodic-platform-support (18.8% fail rate in 16 executions)
• [main] 14 failures in pipeline elasticsearch-pull-request (3.6% fail rate in 391 executions)

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

[elasticsearchmachine]

Pinging @elastic/es-storage-engine (Team:StorageEngine)

[not-napoleon]

The windows failures seem unrelated, but the part 4 failures are all related to KNN: test {yaml=search.vectors/46_knn_search_bbq_ivf/Test knn search}

I'm rerouting this to Search Relevance to look into it.

[elasticsearchmachine]

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