def _require_client(self, client):
        if client is None:
            client = self.client
        return client
Creates a vertex index with the specified params.
dataset/ETHPy150Open GoogleCloudPlatform/gcloud-python/gcloud/storage/_helpers.py/_PropertyMixin._require_client--crossover with--dataset/ETHPy150Open espeed/bulbs/bulbs/rexster/client.py/RexsterClient.create_vertex_index