what it is, i mean, what's stopping you from making the next google search?
Tf-Idf? No. Just kidding. Infromation retrieval, text mining, ML/DL ?! what is going on with this field ! Every other resource seems outdated? What is the state of art ?
Reading some of these posts : https://boyter.org/2010/08/build-vector-space-search-engine-python/
https://www.dr-josiah.com/2010/07/building-search-engine-using-redis-and.html
https://stevenloria.com/tf-idf/
https://stories.algolia.com/a-search-engine-in-css-b5ec4e902e97