Александр Аристов wrote:
I want implement searching with ability to set so-called a confidence
level below which I would treat documents as garbage. I cannot defile
the level per query as the level should be relevant for all
documents.

Hmm .. I'm not sure if I understand it properly - if the level is query-independent, then it's a constant factor, which you can put in a field during the index creation - and then you could use a Filter or FunctionQuery to exclude documents with this factor below the threshold.

--
Best regards,
Andrzej Bialecki     <><
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