Hi!
I wouldn't rely on this. It looks like a bug that
it is in public data
and this will probably be gone soon. Generally, the current official
answer to the question of "where one can get logs of the search queries
for public use" AFAIK is "there's no way to get it without signing
papers and going through procedures".
See also:
https://meta.wikimedia.org/wiki/Discovery/Data_access_guidelines
--
Stas Malyshev
smalyshev(a)wikimedia.org