@query_params('field_statistics', 'fields', 'ids', 'offsets', 'parent',
        'payloads', 'positions', 'preference', 'realtime', 'routing',
        'term_statistics', 'version', 'version_type')
    def mtermvectors(self, index=None, doc_type=None, body=None, params=None):
        return self.transport.perform_request('GET', _make_path(index,
            doc_type, '_mtermvectors'), params=params, body=body)
Multi termvectors API allows to get multiple termvectors based on an
dataset/ETHPy150Open elastic/elasticsearch-py/elasticsearch/client/__init__.py/Elasticsearch.mtermvectors