def _verify_vectorIndex(self) -> None:
        """
        Check if the connected Neptune Analytics graph has VSS enabled and that the dimensions are the same.
        """
        resp = self._client.get_graph(graphIdentifier=self.graph_identifier)

        if "vectorSearchConfiguration" in resp:
            if (
                not resp["vectorSearchConfiguration"]["dimension"]
                == self.embedding_dimension
            ):
                raise ValueError(
                    f"Vector search index dimension for Neptune Analytics graph does not match the provided value."
                )
        else:
            raise ValueError(
                f"Vector search index does not exist for the Neptune Analytics graph."
            )

        Check if the connected Neptune Analytics graph has VSS enabled and that the dimensions are the same.
        
llama-index-integrations/vector_stores/llama-index-vector-stores-neptune/llama_index/vector_stores/neptune/base.py