How would I go about this?

I have a ton of grouped pdf files that I need to store in such a way that I can read and search them in the fastest way possible. Write/Annotate/Delete times are not important.

* The pdfs are already grouped by various themes and alphanumerically. This should facilitate searching.

* Average file size is about 2MB.

* There are about 2.5M files

How would I go about this?

>>5
http://nlp.stanford.edu/IR-book/html/htmledition/an-example-information-retrieval-problem-1.html

How do get Antony and Cleopatra and Hamlet from

110100 AND 110111 AND 101111 = 100100