Checkstyle issue fix.

Author: mashhurs

x-pack/plugin/logstash/src/main/java/org/elasticsearch/xpack/logstash/rest/RestPutPipelineAction.java

@@ -59,7 +59,8 @@ private static void validatePipelineId(String id) {
             throw new IllegalArgumentException(
                 "Invalid pipeline ["
                     + id
-                    + "] ID received. Pipeline ID must begin with a letter or underscore and can contain only letters, underscores, dashes, hyphens and numbers"
+                    + "] ID received. Pipeline ID must begin with a letter or underscore and can contain only letters, "
+                    + "underscores, dashes, hyphens and numbers"
             );
         }
     }