log when an instance is not added because of its state

src/main/java/org/elasticsearch/discovery/ec2/AwsEc2UnicastHostsProvider.java

@@ -181,6 +181,8 @@ public class AwsEc2UnicastHostsProvider extends AbstractComponent implements Uni
                     } else {
                         logger.trace("not adding {}, address is null, host_type {}", instance.getInstanceId(), hostType);
                     }
+                } else {
+                    logger.trace("not adding {}, state {} is not pending or running", instance.getInstanceId(), state.getName());
                 }
             }
         }