Baloo

Baloo is Article description::a utility included in the KDE/Plasma software suite that indexes and searches files for metadata.

Usage
Baloo includes a userspace utility to manage it's functionality:

Baloo is using 100% of one CPU core
When Baloo is running it will use 100% of one CPU core. To disable indexing (which will impact the ability to search for files) see the disable section above.