'Retrieve field stats per node(s) or cluster wide
:ref:`nodes info <es-guide-reference-api-admin-cluster-nodes-stats>` API allows to retrieve one or more (or all)
the cluster nodes info about field data memory usage'

def node_field_stats(self, nodes=None):

    parts = ['_nodes', 'stats', 'indices']
    if nodes:
        paths = ['_nodes', ','.join(nodes), 'stats', 'indices']
    path = make_path(*parts)
    return self.conn._send_request('GET', path)
