Seeking easy AI tool that only indexes 5 pdf files

I have a website that tries to decipher government documents that list benefits to certain people.

There are 5 specific government provided pdf documents that specify these details, but they are long-winded and sometimes even confusing and contradictory in some parts.

So I am trying to find an AI search engine that only indexes these 5 documents, and allows users to enter a search term like:

“I am a 65 years old male. Under what conditions can I claim x …

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