code: private BatchResult createBatchResult(RESTResponse response, DBObjectBatch dbObjBatch) {
          // See what kind of message payload, if any, we received.
          BatchResult result = null;
          if (response.getCode().isError()) {
              String errMsg = response.getBody();
              if (errMsg.length() == 0) {
                  errMsg = "Unknown error; response code=" + response.getCode();
              }
              result = BatchResult.newErrorResult(errMsg);
          } else {
              result = new BatchResult(getUNodeResult(response));
              copyObjectIDsToBatch(result, dbObjBatch);
          }
          return result;
      }
docs: Extract the BatchResult from the given RESTResponse. Could be an error.