Do not start bootstrap service if already bootstrapped

Author: DaveCTurner

server/src/main/java/org/elasticsearch/cluster/coordination/ClusterBootstrapService.java

@@ -179,7 +179,6 @@ public GetDiscoveredNodesResponse read(StreamInput in) throws IOException {
     }
 
     public void stop() {
-        assert running == true;
         running = false;
     }
 

server/src/main/java/org/elasticsearch/cluster/coordination/Coordinator.java

@@ -501,7 +501,9 @@ public void startInitialJoin() {
             becomeCandidate("startInitialJoin");
         }
 
-        clusterBootstrapService.start();
+        if (isInitialConfigurationSet() == false) {
+            clusterBootstrapService.start();
+        }
     }
 
     @Override