Signed-off-by: Andriy Redko andriy.redko@aiven.io

Description

Backport of #1815 to 1.x

Using opensearch.yaml-rest-test Gradle plugin outside of the OpenSearch core (fe, in plugins), for example yamlRestTest, fails with the following exception:

> Task :yamlRestTest

org.opensearch.path.to.plugin.RenameClientYamlTestSuiteIT > initializationError FAILED
    java.lang.NoClassDefFoundError: org/apache/logging/log4j/core/Layout

Since the log4j-core is declared as optional, it is not being picked up. Adding it as an explicit dependency does not solve the problem either (see please opensearch-project/opensearch-plugin-template-java#16 for more details) because the task uses dedicated configuration yamlRestTestImplementation and only its dependencies.

Issues Resolved

Closes #1814

Check List

• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• Commits are signed per the DCO using --signoff

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