[BUG] StableClusterManagerDisruptionIT.testStaleClusterManagerNotHijackingMajority (Random Test Failure)

[CEHENKLE]

Describe the bug
Random Test Failure. Please dig in, and figure out what went wrong :(

https://ci.opensearch.org/logs/ci/workflow/OpenSearch_CI/PR_Checks/Gradle_Check/gradle_check_1066_reports.zip

[tlfeng]

Add more information:

https://ci.opensearch.org/logs/ci/workflow/OpenSearch_CI/PR_Checks/Gradle_Check/gradle_check_1066.log

> Task :server:internalClusterTest

REPRODUCE WITH: ./gradlew ':server:internalClusterTest' --tests "org.opensearch.discovery.StableMasterDisruptionIT.testStaleMasterNotHijackingMajority" -Dtests.seed=69CC1732A5C19596 -Dtests.security.manager=true -Dtests.jvm.argline="-XX:TieredStopAtLevel=1 -XX:ReservedCodeCacheSize=64m" -Dtests.locale=sv -Dtests.timezone=America/Mexico_City -Druntime.java=17

org.opensearch.discovery.StableMasterDisruptionIT > testStaleMasterNotHijackingMajority FAILED
    java.lang.AssertionError: node_t2: [Tuple [v1=node_t1, v2=null]]
        at __randomizedtesting.SeedInfo.seed([69CC1732A5C19596:36CA5A3D841A4A9A]:0)
        at org.junit.Assert.fail(Assert.java:88)
        at org.junit.Assert.assertTrue(Assert.java:41)
        at org.opensearch.discovery.StableMasterDisruptionIT.lambda$testStaleMasterNotHijackingMajority$5(StableMasterDisruptionIT.java:253)
        at org.opensearch.test.OpenSearchTestCase.assertBusy(OpenSearchTestCase.java:1048)
        at org.opensearch.test.OpenSearchTestCase.assertBusy(OpenSearchTestCase.java:1021)
        at org.opensearch.discovery.StableMasterDisruptionIT.testStaleMasterNotHijackingMajority(StableMasterDisruptionIT.java:250)

[saratvemulapalli]

#2541 (comment)

[Poojita-Raj]

Test renamed following new naming convention of cluster manager instead of master node.