[CI] KnnSearchSingleNodeTests testKnnSearchAction failing

[elasticsearchmachine]

Build Scans:

• elasticsearch-periodic-platform-support #3440 / almalinux-8_platform-support-unix
• elasticsearch-pull-request #26232 / part-1

Reproduction Line:

./gradlew ":server:test" --tests "org.elasticsearch.action.search.KnnSearchSingleNodeTests.testKnnSearchAction" -Dtests.seed=314113B7CA4A402C -Dtests.locale=de-CH -Dtests.timezone=Africa/Nouakchott -Druntime.java=22

Applicable branches:
main

Reproduces locally?:
N/A

Failure History:
See dashboard

Failure Message:

java.lang.AssertionError: 
Expected: <0>
     but: was <1>

Issue Reasons:

• [main] 2 failures in test testKnnSearchAction (0.8% fail rate in 254 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] 2 failures in test testKnnSearchAction (0.8% fail rate in 254 executions)

Build Scans:

• elasticsearch-periodic-platform-support #3440 / almalinux-8_platform-support-unix
• elasticsearch-pull-request #26232 / part-1

[elasticsearchmachine]

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

[benwtrent]

NOOOOO

1> [2024-07-18T20:11:49,729][INFO ][o.e.a.s.KnnSearchSingleNodeTests] [testKnnSearchAction] --> waiting for all free_context tasks to complete within a reasonable time

        assertThat(searchService.getActiveContexts(), equalTo(0));

@pmpailis :(

[pmpailis]

:( this has manifested in many test cases. WIll update #110790 to capture more tests and re-run them through the PR until a new failure..

[pmpailis]

A fix for this has been merged with #111153. Closing this one.