@delaing - PDF's can be indexed and then quickly searched by things like Windows Search, OS/X Spotlight and Linux Recoll. There's a calibre plug-in that integrates Recoll into the Linux version of calibre.
For Windows Search I create a CSV of Windows Search Results, a friend does the same for OS/X Spotlight. We both read the CSV with the Import List plug-in, and get it to create a Reading List (another plug-in)
Example - I wanted to find what I had in my library for 'Coco Bonds' or "Contingent Convertible'. To my surprise I found I had articles and papers going back as far as the early 90's with references back to the '70s. This enabled me to create and add a new tag for 'Coco Bond' to about 60 existing 'books'. Coco Bonds were one of the sleeping dogs let off the leash to play a role in the Financial Crash of 2007/8.
BR
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