mediaanalysisd burning up CPU - Mojave on 2015 macbookpro only not my 2018 macbookpro on mojave.

Ever since I upgraded to Mojave this morning on my 2015 macbookpro only not my 2018 macbookpro on mojave., If I leave Activity Monitor open, I can see process mediaanalysisd using 48-97% CPU. When I try to click on another app while that's running, it takes several seconds for the app to respond. Just wiggling the mouse and waiting a few seconds causes the process to go back to sleep.

I've seen other older threads that suggest deleting \System\Library\LaunchAgents\com.apple.mediaanalysisd.plist, but that can't be done, not even using the Terminal app and sudo rm. I saw one other thread that suggested rebooting in Recovery mode (Command-R) and re-installing the operating system. I've done that, and while my overall performance seems to have improved, I still get this silly process starting up.

What is this process doing? Is there some option I can set somewhere - perhaps in the Photos app - that will get it to stop?