add logging on the size of message received

Author: kimchy

src/main/java/org/elasticsearch/bulk/udp/BulkUdpService.java

@@ -176,6 +176,7 @@ class Handler extends SimpleChannelUpstreamHandler {
  @Override
  public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) throws Exception {
  ChannelBuffer buffer = (ChannelBuffer) e.getMessage();
+ logger.trace("received message size [{}]", buffer.readableBytes());
  try {
  bulkProcessor.add(new ChannelBufferBytesReference(buffer), false, null, null);
  } catch (Exception e1) {