Do not pass executor shutdown to super constructor

The main constructor for rejected execution exception its executor
shutdown constructor parameter to the super constructor where it would
be used as a formatting parameter. This is a mistake so this commit
fixes this issue.

core/src/main/java/org/elasticsearch/common/util/concurrent/EsRejectedExecutionException.java

@@ -31,7 +31,7 @@ public class EsRejectedExecutionException extends ElasticsearchException {
     private final boolean isExecutorShutdown;
 
     public EsRejectedExecutionException(String message, boolean isExecutorShutdown) {
-        super(message, isExecutorShutdown);
+        super(message);
         this.isExecutorShutdown = isExecutorShutdown;
     }