I don't have a PW4, so I'm extrapolating previous experience... if the Kindle is unplugged, it's probably going to hibernation, and will not finish indexing unless frequently woken up and put back to sleep.. This is what the Oasis2 *should* do when given a big bunch of books.
To summarize simply,, if you load a bunch of books on a new Kindle, leave it plugged in for a few hours. A charger is best, (for simplicity, no real difference otherwise.), but if you using a PC, "Eject" the device from the comptuer operating system, and use the power button (or sleep cover) to put it to sleep. It will finish indexing in record time.
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