I have 8 calibre libraries, only 1 of which, my Test library, has a full-text-search.db file. I had one in my Books library but I deleted it, and it hasn't reappeared. I haven't used FTS on the other 6 libraries.
I'm sticking with my current content search tools - Windows Search (mainly), FileLocator Pro, and X1; plus calibre integration via the Drop Search Results plugin.
BR
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