code: def _FormatMessageShort(self, event):
      
      _, message_short = self._output_mediator.GetFormattedMessages(event)
      if message_short is None:
        data_type = getattr(event, 'data_type', 'UNKNOWN')
        raise errors.NoFormatterFound(
            'Unable to find event formatter for: {0:s}.'.format(data_type))
  
      return message_short
docs: Formats the short message.
  
      Args:
        event (EventObject): event.
  
      Returns:
        str: short message field.
  
      Raises:
        NoFormatterFound: if no event formatter can be found to match the data
            type in the event.