if you didn't have to change the index then you haven't got all the factors needed to do it well. terms can't cross sentence boundaries and the index doesn't store sentence boundaries.
You mean if you have text like this: "Hello Herb. Have a nice day!", you want to prevent phrase queries for "herb have"? You could prevent sentence boundary crossing with clever use of the token position I suspect. Would that accomplish what you're after?
Could you give a really dumbed down simple example of what you mean by inter-term correlation?
Erik
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