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0.9.1.15. A free-text "index"

OK, even with all the automagical indexing, cross-referencing, etc., occasions will arise when you say, "Help! I need to look absolutely everywhere for <foo>!" (Like you do with grep/tags, but preferably nicer -- all the tricks of the free-text indexing trade.)

It would be great to have a "free text index" button or pseudo-node (an Info "node" that, when you jump to it, puts you in a free-text-search mode. Of course, the free-text-search should be able to plunk you down in the Info node you finally select).

I really don't want to implement this myself :-)