better method name, to correspond to addLast

src/main/java/org/elasticsearch/cluster/ClusterService.java

@@ -29,8 +29,6 @@ import org.elasticsearch.common.unit.TimeValue;
 /**
  * The cluster service allowing to both register for cluster state events ({@link ClusterStateListener})
  * and submit state update tasks ({@link ClusterStateUpdateTask}.
- *
- *
  */
 public interface ClusterService extends LifecycleComponent<ClusterService> {
 
@@ -57,7 +55,7 @@ public interface ClusterService extends LifecycleComponent<ClusterService> {
     /**
      * Adds a priority listener for updated cluster states.
      */
-    void addPriority(ClusterStateListener listener);
+    void addFirst(ClusterStateListener listener);
 
     /**
      * Adds last listener.

src/main/java/org/elasticsearch/cluster/routing/RoutingService.java

@@ -61,7 +61,7 @@ public class RoutingService extends AbstractLifecycleComponent<RoutingService> i
         this.clusterService = clusterService;
         this.allocationService = allocationService;
         this.schedule = componentSettings.getAsTime("schedule", timeValueSeconds(10));
-        clusterService.addPriority(this);
+        clusterService.addFirst(this);
     }
 
     @Override

src/main/java/org/elasticsearch/cluster/service/InternalClusterService.java

@@ -150,7 +150,7 @@ public class InternalClusterService extends AbstractLifecycleComponent<ClusterSe
         return this.clusterState;
     }
 
-    public void addPriority(ClusterStateListener listener) {
+    public void addFirst(ClusterStateListener listener) {
         priorityClusterStateListeners.add(listener);
     }