code: @Override
      public StartServerResult startServer(StartServerRequest request) {
          request = beforeClientExecution(request);
          return executeStartServer(request);
      }
docs: <p>
  Changes the state of a Secure File Transfer Protocol (SFTP) server from <code>OFFLINE</code> to
  <code>ONLINE</code>. It has no impact on an SFTP server that is already <code>ONLINE</code>. An
  <code>ONLINE</code> server can accept and process file transfer jobs.
  </p>
  <p>
  The state of <code>STARTING</code> indicates that the server is in an intermediate state, either not fully able
  to respond, or not fully online. The values of <code>START_FAILED</code> can indicate an error condition.
  </p>
  <p>
  No response is returned from this call.
  </p>
  
  @param startServerRequest
  @return Result of the StartServer operation returned by the service.
  @throws ServiceUnavailableException
  The request has failed because the AWS Transfer for SFTP service is not available.
  @throws InternalServiceErrorException
  This exception is thrown when an error occurs in the AWS Transfer for SFTP service.
  @throws InvalidRequestException
  This exception is thrown when the client submits a malformed request.
  @throws ResourceNotFoundException
  This exception is thrown when a resource is not found by the AWS Transfer for SFTP service.
  @sample AWSTransfer.StartServer
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/transfer-2018-11-05/StartServer" target="_top">AWS API
  Documentation</a>