Fix spotless issue

Signed-off-by: Xue Zhou <[email protected]>

Author: xuezhou25

server/src/main/java/org/opensearch/InvalidArgumentException.java

@@ -17,7 +17,7 @@
  *
  * @opensearch.internal
  */
-public class InvalidArgumentException extends OpenSearchException{
+public class InvalidArgumentException extends OpenSearchException {
     public InvalidArgumentException(String message) {
         super(message);
     }