Go to the home screen, tap the "Search" button, and enter a string of random letters as a search string. When you get the results back, if the "Text in Books" line is highlighted, tap it and you'll see a screen saying "10 (or whatever) items not yet indexed". Tap that line and it'll show you what the offending items are.
You should wait until all items have completed indexing before adding any more. Indexing happens enormously more quickly with the Kindle connected to a wall charger.
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