Part of macOS
spotlightknowledged…Spotlight knowledge
○ Leave it
Prepares Spotlight’s suggestions and answers.
What it is
Builds the knowledge Spotlight uses for suggestions.
If you stop it
macOS starts it again straight away. Leave it.
The verdict
○ Leave it. Part of macOS, or something that starts again by itself. You never need to close these.
In Activity Monitor
spotlightknowledged…
… means any name that starts this way.
From Procession’s guide, in the words the app shows.