Comment # 4 on bug 954774 from Christopher HORLER

baloo_file and baloo_file_extractor are (still) resource hogs on my system.

I'm strugging to work out what the current method is to make it reveal what
it's indexing (and thus the likely cause) - although I noticed a currentFile
property in the DBus interface that looks promising.

To workaround (temporarily) it seems possible to disable it via the KDE System
Settings panel (Search->File Search, uncheck "Enable File Search").

I did a little digging:
Leap 42.1 Update debug info's don't match the version of the update (they're
missing from the Debug update repo?), so I installed the development build
service packages for baloo.