code: def cluster_2_json(self):
          
          LOGGER.debug("Cluster.cluster_2_json")
          json_obj = {
              'clusterID': self.id,
              'clusterName': self.name,
              'clusterContainersID': self.containers_id
          }
          return json_obj
docs: transform this local object ot Ariane server JSON object
          :return: the JSON object