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Very happy to report that Adobe's Chat Support tech helped me solve this. They had me reset my Preferences by quiting InDesign and then holding Shift+Command+Control+Option IMMEDIATELY after starting InDesign. Note that at first I only opened one of the documents in my book and found that the problem still existed. Then, after opening the book that the document was in and turning on Overprint View, I was able to Generate an Index using "Include Book Documents" exactly as I'd hoped to do BEFORE I posted this.
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