iOS 9 High CPU (mediaanalysisd process)

I have two devices that I am testing iOS 9 on (both are iPhone 6 Plus's). I noticed that one of these devices is running warm when sleeping and on the charger, with no apps loaded, no GPS activity, etc (airplane mode is on). Instruments is indicating that once the device goes to sleep, the mediaanalysisd process is consuming 28% CPU almost constantly (it does drop to 12% after awhile, but it keeps running). This is a system/root process, and I presume it is looking at the media library. I am only seeing this on the one device. They have different sets of apps and settings, so that is not surprising. Does anyone know more about that process?