code: def stats(self, node_id=None, metric=None, index_metric=None, params=None):
          
          return self.transport.perform_request(
              "GET",
              _make_path("_nodes", node_id, "stats", metric, index_metric),
              params=params,
          )
docs: The cluster nodes stats API allows to retrieve one or more (or all) of
          the cluster nodes statistics.
          `<https://www.elastic.co/guide/en/elasticsearch/reference/current/cluster-nodes-stats.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: Limit the information returned to the specified metrics
          :arg index_metric: Limit the information returned for `indices` metric
              to the specific index metrics. Isn't used if `indices` (or `all`)
              metric isn't specified.
          :arg completion_fields: A comma-separated list of fields for `fielddata`
              and `suggest` index metric (supports wildcards)
          :arg fielddata_fields: A comma-separated list of fields for `fielddata`
              index metric (supports wildcards)
          :arg fields: A comma-separated list of fields for `fielddata` and
              `completion` index metric (supports wildcards)
          :arg groups: A comma-separated list of search groups for `search` index
              metric
          :arg include_segment_file_sizes: Whether to report the aggregated disk
              usage of each one of the Lucene index files (only applies if segment
              stats are requested), default False
          :arg level: Return indices stats aggregated at index, node or shard
              level, default 'node', valid choices are: 'indices', 'node',
              'shards'
          :arg timeout: Explicit operation timeout
          :arg types: A comma-separated list of document types for the `indexing`
              index metric