[CI] CoreWithMultipleProjectsClientYamlTestSuiteIT class failing

[elasticsearchmachine]

Build Scans:

• elasticsearch-intake #28170 / part2
• elasticsearch-intake #28166 / part2

Reproduction Line:

./gradlew ":x-pack:qa:multi-project:core-rest-tests-with-multiple-projects:yamlRestTest" --tests "org.elasticsearch.multiproject.test.CoreWithMultipleProjectsClientYamlTestSuiteIT.test {yaml=test/ingest/360_append_allow_duplicates/allow_duplicates (false) removes duplicates with an empty array and templating}" -Dtests.seed=A478ED28F72FB7B9 -Dtests.locale=ks-Arab-IN -Dtests.timezone=Asia/Kolkata -Druntime.java=24

Applicable branches:
9.1

Reproduces locally?:
N/A

Failure History:
See dashboard

Failure Message:

java.lang.IllegalArgumentException: Unknown feature ingest.append.copy_from: check the respective FeatureSpecification is provided both in module-info.java as well as in META-INF/services and verify the module is loaded during tests.

Issue Reasons:

• [9.1] 2 consecutive failures in class org.elasticsearch.multiproject.test.CoreWithMultipleProjectsClientYamlTestSuiteIT
• [9.1] 2 consecutive failures in step part2
• [9.1] 2 consecutive failures in pipeline elasticsearch-intake
• [9.1] 2 failures in class org.elasticsearch.multiproject.test.CoreWithMultipleProjectsClientYamlTestSuiteIT (2.4% fail rate in 83 executions)
• [9.1] 2 failures in step part2 (28.6% fail rate in 7 executions)
• [9.1] 2 failures in pipeline elasticsearch-intake (28.6% fail rate in 7 executions)

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

[elasticsearchmachine]

Pinging @elastic/es-data-management (Team:Data Management)

[nielsbauman]

Fixed by #134384