code: @Override
      public DisableUserResult disableUser(DisableUserRequest request) {
          request = beforeClientExecution(request);
          return executeDisableUser(request);
      }
docs: <p>
  Disables the specified user in the user pool. Users can't sign in to AppStream 2.0 until they are re-enabled.
  This action does not delete the user.
  </p>
  
  @param disableUserRequest
  @return Result of the DisableUser operation returned by the service.
  @throws ResourceNotFoundException
  The specified resource was not found.
  @sample AmazonAppStream.DisableUser
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/appstream-2016-12-01/DisableUser" target="_top">AWS API
  Documentation</a>