**Build scan:**
https://gradle-enterprise.elastic.co/s/bcxstpjolnb2q/tests/:x-pack:plugin:ccr:internalClusterTest/org.elasticsearch.xpack.ccr.FollowerFailOverIT/testReadRequestsReturnLatestMappingVersion

**Reproduction line:**
```
./gradlew ':x-pack:plugin:ccr:internalClusterTest' --tests "org.elasticsearch.xpack.ccr.FollowerFailOverIT.testReadRequestsReturnLatestMappingVersion" -Dtests.seed=A75C1F0C6F541957 -Dtests.locale=fr-CA -Dtests.timezone=America/Tijuana -Druntime.java=20
```

**Applicable branches:**
8.10

**Reproduces locally?:**
Didn't try

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

**Failure excerpt:**
```
com.carrotsearch.randomizedtesting.UncaughtExceptionError: Captured an uncaught exception in thread: Thread[id=498, name=elasticsearch[follower2][clusterApplierService#updateTask][T#1], state=RUNNABLE, group=TGRP-FollowerFailOverIT]

  at __randomizedtesting.SeedInfo.seed([A75C1F0C6F541957:A564CB31A58082CC]:0)

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

    at __randomizedtesting.SeedInfo.seed([A75C1F0C6F541957]:0)
    at org.elasticsearch.discovery.PeerFinder.closePeers(PeerFinder.java:182)
    at org.elasticsearch.cluster.coordination.Coordinator.onClusterStateApplied(Coordinator.java:415)
    at org.elasticsearch.cluster.coordination.Coordinator.lambda$handleApplyCommit$8(Coordinator.java:403)
    at org.elasticsearch.action.ActionListenerImplementations$MappedActionListener.lambda$map$0(ActionListenerImplementations.java:108)
    at org.elasticsearch.action.ActionListenerImplementations$MappedActionListener.onResponse(ActionListenerImplementations.java:89)
    at org.elasticsearch.cluster.service.ClusterApplierService$ClusterApplyActionListener.onResponse(ClusterApplierService.java:598)
    at org.elasticsearch.cluster.service.ClusterApplierService$ClusterApplyActionListener.onResponse(ClusterApplierService.java:569)
    at org.elasticsearch.cluster.service.ClusterApplierService.runTask(ClusterApplierService.java:439)
    at org.elasticsearch.cluster.service.ClusterApplierService$UpdateTask.run(ClusterApplierService.java:154)
    at org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingRunnable.run(ThreadContext.java:916)
    at org.elasticsearch.common.util.concurrent.PrioritizedEsThreadPoolExecutor$TieBreakingPrioritizedRunnable.runAndClean(PrioritizedEsThreadPoolExecutor.java:217)
    at org.elasticsearch.common.util.concurrent.PrioritizedEsThreadPoolExecutor$TieBreakingPrioritizedRunnable.run(PrioritizedEsThreadPoolExecutor.java:183)
    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)

```
server/src/main/java/org/elasticsearch/cluster/coordination/Coordinator.java
)
            );
        }));
    }
    private void sendJoinPing(DiscoveryNode discoveryNode, TransportRequestOptions.Type channelType, ActionListener<Void> listener) {
        transportService.sendRequest(
            discoveryNode,
            JoinHelper.JOIN_PING_ACTION_NAME,
            TransportRequest.Empty.INSTANCE,
            TransportRequestOptions.of(null, channelType),
            TransportResponseHandler.empty(clusterCoordinationExecutor, listener.delegateResponse((l, e) -> {
                logger.warn(() -> format("failed to ping joining node [%s] on channel type [%s]", discoveryNode, channelType), e);
                listener.onFailure(
                    new IllegalStateException(
                        String.format(
                            Locale.ROOT,
                            "failure when sending a join ping request from [%s] to [%s]",
                            getLocalNode().descriptionWithoutAttributes(),
                            discoveryNode.descriptionWithoutAttributes()
                        ),
                        e
                    )
                );
            }))
        );
    }
    private void processJoinRequest(JoinRequest joinRequest, ActionListener<Void> joinListener) {
        assert Transports.assertNotTransportThread("blocking on coordinator mutex and maybe doing IO to increase term");
        final Optional<Join> optionalJoin = joinRequest.getOptionalJoin();
        try {