[CI] MlWithSecurityIT test {yaml=ml/start_data_frame_analytics/Test start classification analysis when the dependent variable is missing} failing

[elasticsearchmachine]

Build Scans:

• elasticsearch-periodic-platform-support #6802 / ubuntu-2204_platform-support-unix
• elasticsearch-intake #19229 / part4

Reproduction Line:

./gradlew ":x-pack:plugin:ml:qa:ml-with-security:yamlRestTest" --tests "org.elasticsearch.smoketest.MlWithSecurityIT.test {yaml=ml/start_data_frame_analytics/Test start classification analysis when the dependent variable is missing}" -Dtests.seed=784C09CF6D582B06 -Dtests.locale=en-SG -Dtests.timezone=America/Indiana/Vevay -Druntime.java=23

Applicable branches:
main

Reproduces locally?:
N/A

Failure History:
See dashboard

Failure Message:

java.lang.AssertionError: Failure at [ml/start_data_frame_analytics:242]: the error message was expected to match the provided regex but didn't
Expected: no mappings could be found for field \[missing\]
     but: was "{root_cause=[{type=no_shard_available_action_exception, reason=null, stack_trace=org.elasticsearch.action.NoShardAvailableActionException\n}], type=exception, reason=all shards failed, caused_by={type=search_phase_execution_exception, reason=all shards failed, phase=query, grouped=true, failed_shards=[{shard=0, index=.ml-stats-000001, node=null, reason={type=no_shard_available_action_exception, reason=null, stack_trace=org.elasticsearch.action.NoShardAvailableActionException\n}}], stack_trace=Failed to execute phase [query], all shards failed; shardFailures {[_na_][.ml-stats-000001][0]: org.elasticsearch.action.NoShardAvailableActionException\n}\n\tat org.elasticsearch.server@9.1.0-SNAPSHOT/org.elasticsearch.action.search.AbstractSearchAsyncAction.onPhaseFailure(AbstractS
[truncated]

Issue Reasons:

• [main] 2 failures in test test {yaml=ml/start_data_frame_analytics/Test start classification analysis when the dependent variable is missing} (0.3% fail rate in 578 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=ml/start_data_frame_analytics/Test start classification analysis when the dependent variable is missing} (0.3% fail rate in 578 executions)

Build Scans:

• elasticsearch-periodic-platform-support #6802 / ubuntu-2204_platform-support-unix
• elasticsearch-intake #19229 / part4

[elasticsearchmachine]

Pinging @elastic/ml-core (Team:ML)