Append indies to update index setting task name (#55714)

This change adds index names to the name of the update index setting 
task so we have more information about the pending tasks.

server/src/main/java/org/elasticsearch/cluster/metadata/MetadataUpdateSettingsService.java

@@ -111,7 +111,7 @@ public class MetadataUpdateSettingsService {
         final Settings openSettings = settingsForOpenIndices.build();
         final boolean preserveExisting = request.isPreserveExisting();
 
-        clusterService.submitStateUpdateTask("update-settings",
+        clusterService.submitStateUpdateTask("update-settings " + Arrays.toString(request.indices()),
                 new AckedClusterStateUpdateTask<ClusterStateUpdateResponse>(Priority.URGENT, request,
                     wrapPreservingContext(listener, threadPool.getThreadContext())) {