The Windows 10 search indexer has a problem: The search indexer is a terrible hog of resources, and I can't find a way to throttle it back, only to turn it off. It's happily taking as much of 100% disk resource, and some processor resource, slowing everything else, destroying productivity.
The solution to the search indexer hogging resources is to turn it off. Of course, as soon as you reboot it'll load itself again.
This is the culprit: SearchIndexer.exe
It can be disabled entirely, or stop it indexing a particular disk. but that stops files being indexed. You have to weigh up whether you really need it, or not.
I just disable it each time it gets annoying.