def update_indexed_vertex(self, _id, data, index_name, keys=None):
        data = self._remove_null_values(data)
        params = dict(_id=_id,data=data,index_name=index_name,keys=keys)
        script = self.scripts.get("update_indexed_vertex")
        return self.gremlin(script,params)

    # Model Proxy - Edge
Start serialization -- open the XML document and the root element.
dataset/ETHPy150Open espeed/bulbs/bulbs/rexster/client.py/RexsterClient.update_indexed_vertex--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/_internal/django/core/serializers/xml_serializer.py/Serializer.start_serialization