make netty4 http request public

Author: jaymode

modules/transport-netty4/src/main/java/org/elasticsearch/http/netty4/Netty4HttpRequest.java

@@ -34,7 +34,7 @@
 import java.util.HashMap;
 import java.util.Map;
 
-class Netty4HttpRequest extends RestRequest {
+public class Netty4HttpRequest extends RestRequest {
 
     private final FullHttpRequest request;
     private final Channel channel;