@DrChiper - I tried DocFetcher in 2012, my notes indicate it was quite slow, crashed a lot (not unusual for Jave apps), and there were a number of circumstances where index rebuilding was necessary. At the time it didn't support ePUB and its support for DOCX was a bit off-piste. I also had the impression it was geared towards building the indexes dynamically rather than building them progressively.
I don't know if DocFetcher's results list can be read by the Drop Search Results plugin. For me that would be a must have. I'm not really interested in a solution that only searches within one or more calibre libraries.
Kovid has full text search in his sights, IIRC he's intends using Lucene to do the heavy lifting - which is what DocFetcher apparently uses.
A search for 'docfetcher' in the MR calibre forum should find a few threads
BR
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