[CI] EsqlClientYamlIT test {p0=esql/70_locale/Date format with Italian locale} failing

[elasticsearchmachine]

Build Scans:

• elasticsearch-intake #9878 / 8.16.0_bwc-snapshots
• elasticsearch-pull-request #31964 / 8.16.0_bwc-snapshots

Reproduction Line:

./gradlew ":x-pack:plugin:esql:qa:server:mixed-cluster:v8.16.0#yamlRestTest" -Dtests.class="org.elasticsearch.xpack.esql.qa.mixed.EsqlClientYamlIT" -Dtests.method="test {p0=esql/70_locale/Date format with Italian locale}" -Dtests.seed=573CAB57EE94AAE1 -Dtests.bwc=true -Dtests.locale=pa-Arab-PK -Dtests.timezone=UTC -Druntime.java=22

Applicable branches: main

Reproduces locally?: N/A

Failure History: See dashboard&_a=(controlGroupInput:(chainingSystem:HIERARCHICAL,controlStyle:twoLine,ignoreParentSettings:(ignoreFilters:!f,ignoreQuery:!f,ignoreTimerange:!f,ignoreValidations:!t),panels:('0c0c9cb8-ccd2-45c6-9b13-96bac4abc542':(explicitInput:(dataViewId:fbbdc689-be23-4b3d-8057-aa402e9ed0c5,enhancements:(),fieldName:task.keyword,grow:!t,id:'0c0c9cb8-ccd2-45c6-9b13-96bac4abc542',searchTechnique:wildcard,selectedOptions:!(),singleSelect:!t,title:'Gradle%20Task',width:medium),grow:!t,order:0,type:optionsListControl,width:small),'144933da-5c1b-4257-a969-7f43455a7901':(explicitInput:(dataViewId:fbbdc689-be23-4b3d-8057-aa402e9ed0c5,enhancements:(),fieldName:name.keyword,grow:!t,id:'144933da-5c1b-4257-a969-7f43455a7901',searchTechnique:wildcard,selectedOptions:!('test%20%7Bp0%3Desql%2F70_locale%2FDate%20format%20with%20Italian%20locale%7D'),title:Test,width:medium),grow:!t,order:2,type:optionsListControl,width:medium),'4e6ad9d6-6fdc-4fcc-bf1a-aa6ca79e0850':(explicitInput:(dataViewId:fbbdc689-be23-4b3d-8057-aa402e9ed0c5,enhancements:(),fieldName:className.keyword,grow:!t,id:'4e6ad9d6-6fdc-4fcc-bf1a-aa6ca79e0850',searchTechnique:wildcard,selectedOptions:!('org.elasticsearch.xpack.esql.qa.mixed.EsqlClientYamlIT'),title:Suite,width:medium),grow:!t,order:1,type:optionsListControl,width:medium)))))

Failure Message:

java.lang.AssertionError: Failure at [esql/70_locale:50]: got unexpected warning header [
    299 Elasticsearch-8.16.0-83915f890fcb7122f91ab3809dc254def38aa4d7 "Date format [MMMM] contains textual field specifiers that could change in JDK 23"
]

Issue Reasons:

• [main] 2 consecutive failures in step 8.16.0_bwc-snapshots
• [main] 2 failures in test test {p0=esql/70_locale/Date format with Italian locale} (0.9% fail rate in 230 executions)
• [main] 2 failures in step 8.16.0_bwc-snapshots (1.9% fail rate in 106 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 consecutive failures in step 8.16.0_bwc-snapshots
• [main] 2 failures in test test {p0=esql/70_locale/Date format with Italian locale} (0.9% fail rate in 230 executions)
• [main] 2 failures in step 8.16.0_bwc-snapshots (1.9% fail rate in 106 executions)

Build Scans:

• elasticsearch-intake #9878 / 8.16.0_bwc-snapshots
• elasticsearch-pull-request #31964 / 8.16.0_bwc-snapshots

[elasticsearchmachine]

Pinging @elastic/es-analytical-engine (Team:Analytics)