anchor.diff:          "    \"post_date\" : \"2009-11-15T14:12:12\",\n" +
           "    \"message\" : \"trying out Elasticsearch\"\n" +
           "}", ContentType.APPLICATION_JSON);
  +
   Response indexResponse = restClient.performRequest(
           "PUT",
           "/twitter/tweet/1",
           Collections.<String, String>emptyMap(),
           entity);
  -
  -
  ---------------------------------------------------
  +--------------------------------------------------
  +
  +IMPORTANT: The `ContentType` that you specify for the `HttpEntity` is important
  +because it will be used to set the `Content-Type` header so that Elasticsearch
  +can properly parse the content. Future releases of Elasticsearch will require this
  +to be set properly.
   
   Note that the low-level client doesn't expose any helper for json marshalling
   and un-marshalling. Users are free to use the library that they prefer for that
  
positive.code: --------------------------------------------------
  int numRequests = 10;
  final CountDownLatch latch = new CountDownLatch(numRequests);
  for (int i = 0; i < numRequests; i++) {
      restClient.performRequestAsync(
          "PUT",
  
negative.code:         }
      );
  }
  
  //wait for all requests to be completed
  latch.await();
  
  