[CI] SmokeTestMultiNodeClientYamlTestSuiteIT test {yaml=search.vectors/42_knn_search_int4_flat/Vector similarity with filter only} failing

[elasticsearchmachine]

Build Scans:

• elasticsearch-periodic-platform-support #6145 / rhel-8_platform-support-unix
• elasticsearch-periodic-platform-support #6138 / oraclelinux-8_platform-support-unix

Reproduction Line:

./gradlew ":qa:smoke-test-multinode:yamlRestTest" --tests "org.elasticsearch.smoketest.SmokeTestMultiNodeClientYamlTestSuiteIT" -Dtests.method="test {yaml=search.vectors/42_knn_search_int4_flat/Vector similarity with filter only}" -Dtests.seed=DC5AA32211BA81F1 -Dtests.locale=nb-SJ -Dtests.timezone=America/Pangnirtung -Druntime.java=23

Applicable branches:
8.18

Reproduces locally?:
N/A

Failure History:
See dashboard

Failure Message:

java.lang.AssertionError: Failure at [search.vectors/42_knn_search_int4_flat:231]: field [hits.hits] doesn't have length [1]
Expected: <1>
     but: was <0>

Issue Reasons:

• [8.18] 2 failures in test test {yaml=search.vectors/42_knn_search_int4_flat/Vector similarity with filter only} (1.9% fail rate in 106 executions)
• [8.18] 2 failures in pipeline elasticsearch-periodic-platform-support (50.0% fail rate in 4 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 test {yaml=search.vectors/42_knn_search_int4_flat/Vector similarity with filter only} (1.1% fail rate in 180 executions)

Build Scans:

• elasticsearch-intake #16917 / part1
• elasticsearch-pull-request #54062 / part-1

[elasticsearchmachine]

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

[benwtrent]

fixed in: #121758