RAG AI Data Fetch Structure

My e-commerce site already holds every product record in a MongoDB cluster, and I now want a Retrieval-Augmented Generation (RAG) layer that can pull that data on-demand for search, chat, and merchandising features... (Budget: ₹1500 - ₹12500 INR, Jobs: API Development, Elasticsearch, MongoDB, Natural Language Processing, Node.js, NoSQL Couch & Mongo, Pinecone, Python)