[CI] RootObjectMapperTests testSubobjectsWithRootObjectMapperNamespaceValidator failing

[elasticsearchmachine]

Build Scans:

• elasticsearch-periodic #10767 / release-tests
• elasticsearch-periodic #10761 / release-tests
• elasticsearch-periodic #10749 / release-tests
• elasticsearch-periodic-java-ea #29 / release-tests
• elasticsearch-periodic #10731 / release-tests
• elasticsearch-periodic #10725 / release-tests

Reproduction Line:

./gradlew ":server:test" --tests "org.elasticsearch.index.mapper.RootObjectMapperTests.testSubobjectsWithRootObjectMapperNamespaceValidator" -Dtests.seed=892497948A9DAF12 -Dbuild.snapshot=false -Dtests.jvm.argline="-Dbuild.snapshot=false" -Dlicense.key=x-pack/license-tools/src/test/resources/public.key -Dtests.locale=bs-Cyrl-BA -Dtests.timezone=America/Indiana/Indianapolis -Druntime.java=25

Applicable branches:
main

Reproduces locally?:
N/A

Failure History:
See dashboard

Failure Message:

junit.framework.AssertionFailedError: Unexpected exception type, expected IllegalArgumentException but got org.elasticsearch.index.mapper.MapperParsingException: Failed to parse mapping: unknown subobjects value: auto

Issue Reasons:

• [main] 6 failures in test testSubobjectsWithRootObjectMapperNamespaceValidator (2.1% fail rate in 280 executions)
• [main] 6 failures in step release-tests (54.5% fail rate in 11 executions)
• [main] 5 failures in pipeline elasticsearch-periodic (62.5% fail rate in 8 executions)

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

[elasticsearchmachine]

Pinging @elastic/es-storage-engine (Team:StorageEngine)