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I uninstalled Parallels Desktop, so I don't have a Windows VM any more. However when I type we into Spotlight, the Windows Weather app comes first, and if I press it, it says Parallels Desktop is not installed anymore.
How do I clean the cache or re-build the index? (I am not sure what this operation is called)?
NOTE: I would like to avoid having to use sudo.
Usually it's not necessary to rebuild the Spotlight database to get rid of Windows applications of a deleted Windows VM in the Spotlight results.
To properly remove all traces of a deleted Windows VM with some kind of integration in macOS - like a VM specific Application menu - remove the links of the Windows apps in $HOME/Library/Parallels/Application Menus/ and/or $HOME/Applications (Parallels)/.
To remove Parallels Desktop completely from your Mac remove the following files and folders besides the main app in /Applications:
To see where an item in Spotlight is located, press ⌘↩︎ (cmd-return) to reveal the item in Finder. That error isn't something I'd expect if the item had actually been removed.
You can reindex your disk by adding the disk to System Preferences → Spotlight → Privacy (which will delete the index), then removing it from the list.
