make Response class final

client/rest/src/main/java/org/elasticsearch/client/Response.java

@@ -32,7 +32,7 @@ import java.util.Objects;
  * Holds an elasticsearch response. It wraps the {@link HttpResponse} returned and associates it with
  * its corresponding {@link RequestLine} and {@link HttpHost}.
  */
-public class Response {
+public final class Response {
 
     private final RequestLine requestLine;
     private final HttpHost host;