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- **Description: To handle the hybrid search with RRF(Reciprocal Rank Fusion) in the Elasticsearch, rrf argument was added for adjusting 'rank_constant' and 'window_size' to combine multiple result sets with different relevance indicators into a single result set. (ref: https://www.elastic.co/kr/blog/whats-new-elastic-enterprise-search-8-9-0), - **Issue:** the issue # it fixes (if applicable), - **Dependencies:** No dependencies changed, - **Tag maintainer:** @baskaryan, Nice to meet you, I'm a newbie for contributions and it's my first PR. I only changed the langchain/vectorstores/elasticsearch.py file. I did make format&lint I got this message, ```shell make lint_diff ./scripts/check_pydantic.sh . ./scripts/check_imports.sh poetry run ruff . [ "langchain/vectorstores/elasticsearch.py" = "" ] || poetry run black langchain/vectorstores/elasticsearch.py --check All done! ✨ 🍰 ✨ 1 file would be left unchanged. [ "langchain/vectorstores/elasticsearch.py" = "" ] || poetry run mypy langchain/vectorstores/elasticsearch.py langchain/__init__.py: error: Source file found twice under different module names: "mvp.nlp.langchain.libs.langchain.langchain" and "langchain" Found 1 error in 1 file (errors prevented further checking) make: *** [lint_diff] Error 2 ``` Thank you --------- Co-authored-by: 황중원 <jwhwang@amorepacific.com>