[CI] AutoFollowIT testAutoFollowDatastreamWithClosingFollowerIndex failing

[DaveCTurner]

Looks like a bug introduced in #72407, the assertion looks to be invalid if the task is cancelled while getting the initial state.

Build scan:
https://gradle-enterprise.elastic.co/s/wefykkh3zsqcc/tests/:x-pack:plugin:ccr:internalClusterTest/org.elasticsearch.xpack.ccr.AutoFollowIT/testAutoFollowDatastreamWithClosingFollowerIndex

Reproduction line:

./gradlew ':x-pack:plugin:ccr:internalClusterTest' --tests "org.elasticsearch.xpack.ccr.AutoFollowIT.testAutoFollowDatastreamWithClosingFollowerIndex" -Dtests.seed=F08D6C5BC379CBBB -Dtests.locale=es-CO -Dtests.timezone=Etc/GMT+6 -Druntime.java=20

Applicable branches:
main

Reproduces locally?:
Didn't try

Failure history:
https://gradle-enterprise.elastic.co/scans/tests?tests.container=org.elasticsearch.xpack.ccr.AutoFollowIT&tests.test=testAutoFollowDatastreamWithClosingFollowerIndex

Failure excerpt:

com.carrotsearch.randomizedtesting.UncaughtExceptionError: Captured an uncaught exception in thread: Thread[id=788, name=elasticsearch[leader0][management][T#1], state=RUNNABLE, group=TGRP-AutoFollowIT]

  at __randomizedtesting.SeedInfo.seed([F08D6C5BC379CBBB:1E8EE4659677033A]:0)

  Caused by: java.lang.AssertionError: (No message provided)

    at __randomizedtesting.SeedInfo.seed([F08D6C5BC379CBBB]:0)
    at org.elasticsearch.action.admin.cluster.state.TransportClusterStateAction.masterOperation(TransportClusterStateAction.java:98)
    at org.elasticsearch.action.admin.cluster.state.TransportClusterStateAction.masterOperation(TransportClusterStateAction.java:41)
    at org.elasticsearch.action.support.master.TransportMasterNodeAction.executeMasterOperation(TransportMasterNodeAction.java:124)
    at org.elasticsearch.action.support.master.TransportMasterNodeAction$AsyncSingleAction.lambda$doStart$3(TransportMasterNodeAction.java:235)
    at org.elasticsearch.action.ActionRunnable$3.doRun(ActionRunnable.java:72)
    at org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingAbstractRunnable.doRun(ThreadContext.java:983)
    at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:26)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
    at java.lang.Thread.run(Thread.java:1623)

[elasticsearchmachine]

Pinging @elastic/es-distributed (Team:Distributed)