Many such open source projects already (which is fantastic). I lose track of them. Today it happened I needed a simple way to embed & query 1TB+ of documents,

Many such open source projects already (which is fantastic). I lose track of them. Today it happened I needed a simple way to embed & query 1TB+ of documents, and I was looking at open source options. Can anyone tell me what their go-to solution is now? Could this be the one? And what are the key differences vs. other open source RAG tools like kotaemon?