You need to go in the Search Indexing setting to remove the directory for indexing. And only tick the directory that you want to index.

Also to completely disable it, you needs to disable the service and remove the entry from schedule tasks. It keep coming back because of the service and scheduled tasks are not disabled. This is how Google Chrome keep starting up their updater and bypassing my disabled startup entries for Chrome. Because of scheduled tasks is not removed, Chrome uses that to reactivate their updater and recreate a startup entry. Managed to completely neutered Chrome updater through Sysinternals AutoRuns.