[CI] RareClusterStateIT.testDelayedMappingPropagationOnReplica fails on 7.x

[cbuescher]

Build scan:
https://gradle-enterprise.elastic.co/s/tds3nk2ykh2yc

Repro line:

./gradlew ':server:internalClusterTest' --tests "org.elasticsearch.cluster.coordination.RareClusterStateIT.testDelayedMappingPropagationOnReplica"
-Dtests.seed=1AE8DAD4C04E8D0D
-Dtests.security.manager=true
-Dtests.locale=nl-NL
-Dtests.timezone=Australia/Victoria
-Druntime.java=11

Reproduces locally?:

No

Applicable branches:
7.x

Failure history:

Another recent fairly similar looking failure on master: https://gradle-enterprise.elastic.co/s/b5y6he5hgc6ag (Aug 31th)

Failure excerpt:

java.lang.AssertionError
	at __randomizedtesting.SeedInfo.seed([1AE8DAD4C04E8D0D:66961B1B90A9B6EE]:0)
	at org.junit.Assert.fail(Assert.java:86)
	at org.junit.Assert.assertTrue(Assert.java:41)
	at org.junit.Assert.assertFalse(Assert.java:64)
	at org.junit.Assert.assertFalse(Assert.java:74)
	at org.elasticsearch.cluster.coordination.RareClusterStateIT.testDelayedMappingPropagationOnReplica(RareClusterStateIT.java:377)

[elasticmachine]

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