Baloo was number one in top and I didn't even know what it was. Turned out it was the search indexer for the KDE Plasma dekstop. The funny thing was, I didn't even run KDE at the time, I was running i3! But since Baloo is started from systemd, it was eating away my CPU sycles anyway.
This is how I got rid of this resource hog:
Stopping the baloo indexer
$ balooctl suspend
Disable the baloo indexer
$ balooctl disable
Disabling and stopping the File Indexer
You can verify that it's been disabled:
$ cat .config/baloofilerc
[Basic Settings]
Indexing-Enabled=false
Purge the giga bytes consumed byt he indexer
Since I never use KDE for anything useful on this machine, it's my
work machine, so I use i3, I decided to purge the whole file to save
the disk space (it was occupying more than 4 GBs):
$ balooctl purge
