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Hi, marckd,
it's not a bug, it's a feature
iSearch logs every search request, similar to a counter. btw: if a user searches for more than on word in one request, e.g. "xoops module download", iSearch logs these three words individually.
If you have a "narrow" content on your site, there shouldn't be too much words people are looking for, because they mostly search for the same things...
I also use the module, but only as a webmaster tool. It shows me what users are looking for and whether they get it and what they get. So its helpful for optimizing the contents.
There are about 230 word logged for about 300 search requests.
From time to time I remove some words out of the iSearch database. You can do this in the module administration. You can also use the module's blacklist to reduce the database. E.g. avoid logging words like "and, xoops, download" etc, if you don't need this information.
Maybe Hervé can tell you more.
kind regards
markesh/karim