Hi Arun, Ludo, and everyone,

I Just stumbled upon Arun’s suggestion of doing a guix xsearch extension
to use a xapian search in #39258 so I gave it a try tonight, here’s the
proof of concept.

Search is less than a second (loading guile modules, actual search is
instantaneous) and building the cache takes ~20 seconds.

The whole thing was very easy to make following the guile-xapian
example, and it shows as it is only 71 loc.

So, what do you think? Is it an idea worth pursuing?