Add Netty channel information on write and flush failure

modules/transport-netty4/src/main/java/org/elasticsearch/transport/netty4/Netty4Transport.java

@@ -322,7 +322,8 @@ public class Netty4Transport extends TcpTransport<Channel> {
             } else {
                 final Throwable cause = f.cause();
                 Netty4Utils.maybeDie(cause);
-                logger.warn("write and flush on the network layer failed", cause);
+                logger.warn((Supplier<?>) () ->
+                    new ParameterizedMessage("write and flush on the network layer failed (channel: [])", channel), cause);
                 assert cause instanceof Exception;
                 listener.onFailure((Exception) cause);
             }