Change exception message

Author: bhapas

modules/ingest-common/src/main/java/org/elasticsearch/ingest/common/CefParser.java

@@ -412,7 +412,7 @@ private static Map<String, String> parseExtensions(String extensionString) {
         }
         // If there's any remaining unparsed content, throw an exception
         if (lastEnd < extensionString.length()) {
-            throw new IllegalArgumentException("Invalid extensions; keyless value present: " + extensionString.substring(lastEnd));
+            throw new IllegalArgumentException("Invalid extensions in the CEF event: " + extensionString.substring(lastEnd));
         }
         return extensions;
     }