Part of macOS

`mdbulkimport`Spotlight importer

○ Leave it

Adds batches of files to Spotlight’s index.

What it is

Helps Spotlight index large numbers of files at once.

Why it might be busy

While Spotlight is catching up. Usually until indexing finishes.

If you stop it

macOS starts it again straight away. Leave it.

○ Leave it. Part of macOS, or something that starts again by itself. You never need to close these.

From Procession’s guide, in the words the app shows.