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Since the landing page required everyone interested to enter a keyword to search, the back-end server can record all query and ip-addrs.

I doubt if WikiLeaks.org use this exact same method to study what document attract traffic|attention. WikiLeaks' new releases are not signed by PGP anymore, I take that as either a Warrant Canary or some kinds of warning.

Of course, if everything packed in a torrent, then there's no way to conduct such a study.

You can iterate through all the documents by going to https://www.cia.gov/library/readingroom/search/site, going through each year, and within each year, going through all the result pages.

They likely won't, but would be awesome if someone here on HN did!

Torrents are only for criminals. /s (edit: double sarcasm in fact)