Include command in audit message

Author: prwhelan

x-pack/plugin/transform/src/main/java/org/elasticsearch/xpack/transform/transforms/TransformPersistentTasksExecutor.java

@@ -515,8 +515,9 @@ private void startTask(
                 params.getId(),
                 Strings.format(
                     "Failed while starting Transform. Automatically retrying every [%s] seconds. "
-                        + "To cancel retries, force stop this transform. Failure: [%s]",
+                        + "To cancel retries, use [_transform/%s/_stop?force] to force stop this transform. Failure: [%s]",
                     retryTimer.seconds(),
+                    params.getId(),
                     e.getMessage()
                 )
             );