[CI] MachineDependentHeapTests testMlOnlyOptions failing

[elasticsearchmachine]

Build Scans:

• elasticsearch-periodic #8778 / release-tests
• elasticsearch-periodic #8772 / release-tests
• elasticsearch-periodic #8766 / release-tests
• elasticsearch-periodic #8760 / release-tests
• elasticsearch-periodic #8754 / release-tests
• elasticsearch-periodic #8748 / release-tests
• elasticsearch-periodic #8742 / release-tests
• elasticsearch-periodic #8736 / release-tests
• elasticsearch-periodic #8730 / release-tests

Reproduction Line:

./gradlew ":distribution:tools:server-cli:test" --tests "org.elasticsearch.server.cli.MachineDependentHeapTests.testMlOnlyOptions" -Dtests.seed=2E978286B2E4ECF3 -Dbuild.snapshot=false -Dtests.jvm.argline="-Dbuild.snapshot=false" -Dlicense.key=x-pack/license-tools/src/test/resources/public.key -Dtests.locale=cv-RU -Dtests.timezone=America/Thunder_Bay -Druntime.java=24

Applicable branches: 8.18

Reproduces locally?: N/A

Failure History: See dashboard

Failure Message:

java.lang.AssertionError: 
Expected: iterable with items ["-Xmx272m", "-Xms272m"] in any order
     but: not matched: "-Xms408m"

Issue Reasons:

• [8.18] 9 consecutive failures in step release-tests
• [8.18] 9 failures in test testMlOnlyOptions (3.0% fail rate in 297 executions)
• [8.18] 9 failures in step release-tests (100.0% fail rate in 9 executions)
• [8.18] 9 failures in pipeline elasticsearch-periodic (100.0% fail rate in 9 executions)

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

[elasticsearchmachine]

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

[davidkyle]

The changes made in #128742 are behind are feature flag which is not enabled in release tests, hence these tests are seeing different values.

[elasticsearchmachine]

This has been muted on branch main

Mute Reasons:

• [main] 3 consecutive failures in step release-tests
• [main] 4 failures in test testMlOnlyOptions (1.7% fail rate in 229 executions)
• [main] 3 failures in step release-tests (100.0% fail rate in 3 executions)
• [main] 3 failures in pipeline elasticsearch-periodic (75.0% fail rate in 4 executions)

Build Scans:

• elasticsearch-periodic #8823 / release-tests
• elasticsearch-pull-request #76252 / checkpart1_release-tests
• elasticsearch-periodic #8817 / release-tests
• elasticsearch-periodic #8811 / release-tests