### Description

Currently we have a test that verifies auto following behavior regarding leader and follower cluster restart.

However remote cluster is disabled before the leader restart and configured again after:

https://github.com/elastic/elasticsearch/blob/33b3ccaabc6960f02c005b6bc14a1c527a24875b/x-pack/plugin/ccr/src/internalClusterTest/java/org/elasticsearch/xpack/ccr/RestartIndexFollowingIT.java#L92-L96

This happens as leader cluster changes the port during the restart and otherwise would become not accessible.
x-pack/plugin/ccr/src/internalClusterTest/java/org/elasticsearch/xpack/ccr/RestartIndexFollowingIT.java
@Override
    protected int numberOfNodesPerCluster() {
        return 1;
    }
    @Override
    protected boolean configureRemoteClusterViaNodeSettings() {
        return false;
    }
    @Override
    protected Settings followerClusterSettings() {
        final Settings.Builder settings = Settings.builder().put(super.followerClusterSettings());
        if (randomBoolean()) {
            settings.put(RemoteConnectionStrategy.REMOTE_MAX_PENDING_CONNECTION_LISTENERS.getKey(), 1);