code: def submit(self, event, host=None, source=None, sourcetype=None):
          
          args = { 'index': self.name }
          if host is not None: args['host'] = host
          if source is not None: args['source'] = source
          if sourcetype is not None: args['sourcetype'] = sourcetype
  
          # The reason we use service.request directly rather than POST
          # is that we are not sending a POST request encoded using
          # x-www-form-urlencoded (as we do not have a key=value body),
          # because we aren't really sending a "form".
          self.service.post(PATH_RECEIVERS_SIMPLE, body=event, **args)
          return self
docs: Submits a single event to the index using ``HTTP POST``.
  
          :param event: The event to submit.
          :type event: ``string``
          :param `host`: The host value of the event.
          :type host: ``string``
          :param `source`: The source value of the event.
          :type source: ``string``
          :param `sourcetype`: The sourcetype value of the event.
          :type sourcetype: ``string``
  
          :return: The :class:`Index`.