[brittpart_]

Forgive me if this doesn't make sense:

If I'm implementing search in an application and want to use NLP, do I need to train the search or are these solutions already ready to go? I'm not sure how other people do it/how search works/if you need to tell it what to do.

[ktpsns]

Well, of course the engine needs to have access to some corpus to search on. So the general answer to your question is: yes, however this step typically not called "training" but "indexing".

Most engines will repeatedly index your contents with crawlers or similar.