def _build_index_from_nodes(
        self, nodes: Sequence[BaseNode], **build_kwargs: Any
    ) -> EmptyIndexStruct:
        """
        Build the index from documents.

        Args:
            documents (List[BaseDocument]): A list of documents.

        Returns:
            IndexList: The created summary index.

        """
        del nodes  # Unused
        return EmptyIndexStruct()

        Build the index from documents.

        Args:
            documents (List[BaseDocument]): A list of documents.

        Returns:
            IndexList: The created summary index.

        
llama-index-core/llama_index/core/indices/empty/base.py