code: def info(self, node_id=None, metric=None, params=None):
          
          return self.transport.perform_request(
              "GET", _make_path("_nodes", node_id, metric), params=params
          )
docs: The cluster nodes info API allows to retrieve one or more (or all) of
          the cluster nodes information.
          `<https://www.elastic.co/guide/en/elasticsearch/reference/current/cluster-nodes-info.html>`_
  
          :arg node_id: A comma-separated list of node IDs or names to limit the
              returned information; use `_local` to return information from the
              node you're connecting to, leave empty to get information from all
              nodes
          :arg metric: A comma-separated list of metrics you wish returned. Leave
              empty to return all.
          :arg flat_settings: Return settings in flat format (default: false)
          :arg timeout: Explicit operation timeout