docs: def register(self, model, index):
          """Register the model with the registry"""
          self.model_to_indexes[model].add(index)
          if not self.connected:
              connections.index_name = {}
              from django.conf import settings
              kwargs = {}
              for name, params in settings.ELASTICSEARCH_CONNECTIONS.items():
                  params = copy.deepcopy(params)
                  kwargs[name] = params
                  connections.index_name[name] = params.pop("index_name")
              connections.configure(**kwargs)
              self.connected = True