this and other different end-to-end architectures are offered in deepset/haystack, one of the best and quite mature frameworks to work with LLMs (pre-GPT craze) and do augmented retrieval, etc.

I do feel the article presents old concepts as "emerging".

if you are curious about building something quickly, you can jump into one of the tutorials https://haystack.deepset.ai/tutorials

Over a weekend I've used deepset/haystack to build a Q/A engine over open source communities slack and discord threads that can potentially have an answer - it was a joy and a breeze to implement. If you have question about Metaflow, K8s, Golang, Deepset, Deep Java Library and some other tech - try asking your quick question on https://www.kwq.ai :-)