[CI] CoreWithMultipleProjectsClientYamlTestSuiteIT class failing

[elasticsearchmachine]

Build Scans:

• elasticsearch-periodic #7482 / concurrent-search-tests
• elasticsearch-pull-request #66075 / part-2
• elasticsearch-pull-request #65937 / part-2
• elasticsearch-pull-request #65927 / part-2
• elasticsearch-pull-request #65910 / part-2
• elasticsearch-pull-request #65891 / part-2
• elasticsearch-pull-request #65738 / part-2

Reproduction Line:

./gradlew ":x-pack:qa:multi-project:core-rest-tests-with-multiple-projects:yamlRestTest" --tests "org.elasticsearch.multiproject.test.CoreWithMultipleProjectsClientYamlTestSuiteIT" -Dtests.method="test {yaml=indices.exists_alias/10_basic/Test indices.exists_alias}" -Dtests.seed=44C4D1B130AF90E3 -Dtests.jvm.argline="-Des.concurrent_search=true" -Dtests.locale=en-BE -Dtests.timezone=Antarctica/Mawson -Druntime.java=24

Applicable branches:
main

Reproduces locally?:
N/A

Failure History:
See dashboard

Failure Message:

java.lang.RuntimeException: Failure at [indices.exists_alias/10_basic:3]: Connection refused

Issue Reasons:

• [main] 7 failures in class org.elasticsearch.multiproject.test.CoreWithMultipleProjectsClientYamlTestSuiteIT (0.8% fail rate in 830 executions)
• [main] 6 failures in step part-2 (2.0% fail rate in 298 executions)
• [main] 6 failures in pipeline elasticsearch-pull-request (2.0% fail rate in 298 executions)

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

[elasticsearchmachine]

Pinging @elastic/es-delivery (Team:Delivery)