code: public DeleteMessageBatchResult deleteMessageBatch(DeleteMessageBatchRequest deleteMessageBatchRequest) throws JMSException {
          try {
              prepareRequest(deleteMessageBatchRequest);
              return amazonSQSClient.deleteMessageBatch(deleteMessageBatchRequest);
          } catch (AmazonClientException e) {
              throw handleException(e, "deleteMessageBatch");
          }    
      }
docs: Calls <code>deleteMessageBatch</code> and wraps
  <code>AmazonClientException</code>. This is used to acknowledge multiple
  messages on client_acknowledge mode, so that they can be deleted from SQS
  queue.
  
  @param deleteMessageBatchRequest
  Container for the necessary parameters to execute the
  deleteMessageBatch service method on AmazonSQS. This is the
  batch version of deleteMessage. Max batch size is 10.
  @return The response from the deleteMessageBatch service method, as
  returned by AmazonSQS
  @throws JMSException