Returns:
            List of retrieved Documents
        """
        documents = []
        for query in queries:
            docs = self.retriever.get_relevant_documents(
                query, callbacks=run_manager.get_child()
            )
            documents.extend(docs)
        return documents
[docs]    def unique_union(self, documents: List[Document]) -> List[Document]:
        """Get unique Documents.
        Args:
            documents: List of retrieved Documents
        Returns:
            List of unique retrieved Documents
        """
        return _unique_documents(documents)