langchain/vectorstores/redis.py/RedisVectorStoreRetriever/get_relevant_documents
class RedisVectorStoreRetriever:    def get_relevant_documents(self, query: str) -> List[Document]:
        if self.search_type == "similarity":
            docs = self.vectorstore.similarity_search(query, k=self.k)
        elif self.search_type == "similarity_limit":
            docs = self.vectorstore.similarity_search_limit_score(
                query, k=self.k, score_threshold=self.score_threshold
            )
        else:
            raise ValueError(f"search_type of {self.search_type} not allowed.")
        return docs