[brudgers]

This video provides a basic overview: https://archive.org/details/ucberkeley_webcast_WLpvUGjvmXc and there's more in the next video https://archive.org/details/ucberkeley_webcast_QNce8cVeoeA The highlight is that "information retrieval" is the CS term for full text search. So the better wikipedia page is, https://en.wikipedia.org/wiki/Information_retrieval.

Great for a learning exercise. For a production environment, it's unlikely the organization is such a snow flake. A mature product is probably a better engineering choice than writing one from scratch when you're writing your first one.