@DudaNogueira thank you for the quick reply. However, using the RetrievalQA is not ideal. As this one is deprecated in newer versions (langchain.chains.retrieval_qa.base.RetrievalQA — 🦜🔗 LangChain 0.2.12).
They recommend using create_retrieval_chain (langchain.chains.retrieval.create_retrieval_chain — 🦜🔗 LangChain 0.2.12). Which is using the LCEL principles.
Are there any plans to update the recipe/examples with this?