text: and retiring Justice of the United States Supreme Court. Justice Breyer, thank you for your service.         One of the most serious constitutional responsibilities a President has is nominating someone to serve on the United States Supreme Court.         And I did that 4 days ago, when I nominated Circuit Court of Appeals Judge Ketanji Brown Jackson. One of our nationâ€™s top legal minds, who will continue Justice Breyerâ€™s legacy of excellence.        Score: 0.4917977Now let's do similar search for content in the files we uploadedquery = "We must forever conduct our struggle"found_docs = vectara.similarity_search_with_score(    query, filter="doc.speech = 'I-have-a-dream'")print(found_docs[0])print(found_docs[1])    (Document(page_content='We must forever conduct our struggle on the high plane of dignity and discipline.', metadata={'section': '1'}), 0.7962591)    (Document(page_content='We must not allow our\ncreative protests to degenerate into physical violence. . . .', metadata={'section': '1'}), 0.25983918)Vectara as a Retrieverâ€‹Vectara, as all the other vector stores, can be used also as a LangChain Retriever:retriever = vectara.as_retriever()retriever    VectaraRetriever(vectorstore=<langchain.vectorstores.vectara.Vectara object at 0x12772caf0>, search_type='similarity', search_kwargs={'lambda_val': 0.025, 'k': 5, 'filter': '', 'n_sentence_context': '0'})query = "What did the president say about Ketanji Brown