Add MP fix annotation for cluster state listeners (MP-1966)

We're catching MP exceptions when applying cluster state listeners to
avoid noise in the logs, but we shouldn't forget to remove this `catch`
block at some point in the future.

Author: nielsbauman

server/src/main/java/org/elasticsearch/cluster/service/ClusterApplierService.java

@@ -33,6 +33,7 @@
 import org.elasticsearch.common.util.concurrent.PrioritizedEsThreadPoolExecutor;
 import org.elasticsearch.common.util.concurrent.ThreadContext;
 import org.elasticsearch.core.Assertions;
+import org.elasticsearch.core.FixForMultiProject;
 import org.elasticsearch.core.Nullable;
 import org.elasticsearch.core.Releasable;
 import org.elasticsearch.core.TimeValue;
@@ -579,6 +580,7 @@ private void callClusterStateListeners(ClusterChangedEvent clusterChangedEvent,
         callClusterStateListener(clusterChangedEvent, stopWatch, timeoutClusterStateListeners.keySet());
     }
 
+    @FixForMultiProject(description = "Don't catch multi-project exception")
     private static void callClusterStateListener(
         ClusterChangedEvent clusterChangedEvent,
         Recorder stopWatch,