code: def orchestration(self):
          
  
          # TODO(d0ugal): This code is based on the upstream WIP implementation
          # and should be removed when it lands:
          # https://review.openstack.org/#/c/111786
  
          if self._orchestration is not None:
              return self._orchestration
  
          API_VERSIONS = {
              '1': 'heatclient.v1.client.Client',
          }
  
          heat_client = utils.get_client_class(
              API_NAME,
              self._instance._api_version[API_NAME],
              API_VERSIONS)
          LOG.debug('Instantiating orchestration client: %s', heat_client)
  
          endpoint = self._instance.get_endpoint_for_service_type(
              'orchestration')
          token = self._instance.auth.get_token(self._instance.session)
  
          client = heat_client(
              endpoint=endpoint,
              auth_url=self._instance._auth_url,
              token=token,
              username=self._instance._username,
              password=self._instance._password,
              region_name=self._instance._region_name,
              insecure=self._instance._insecure,
              ca_file=self._instance._cli_options.os_cacert,
          )
  
          self._orchestration = client
          return self._orchestration
docs: Returns an orchestration service client