Baloo

configure Baloo
$HOME/.kde/share/config/baloofilerc
and set
[Basic Settings]
Indexing-Enabled=true

[General]
exclude filters=autom4te,*.rcore,CTestTestfile.cmake,*.o,*.omf,.hg,*.m4,*.orig,.obj,moc_*.cpp,conftest,.pch,.xsession-errors*,CMakeTmpQmake,*.tmp,qrc_*.cpp,po,.svn,.histfile.*,lzo,.bzr,.git,litmain.sh,cmake_install.cmake,CMakeFiles,*.pc,*.nvram,*.elc,*.la,.moc,CMakeCache.txt,confdefs.h,*.gmo,*.csproj,*.rej,config.status,lost+found,confstat,*.pyc,_darcs,CVS,.uic,*.part,libtool,*.aux,*.po,CMakeTmp,Makefile.am,*.lo,ui_*.h,*.loT,*~,*.moc,*.vm*,*.class,core-dumps
exclude filters version=2
exclude folders[$e]=/data3/,/data2/,/mnt/ISO/,$HOME/Archive/
first run=false
folders[$e]=$HOME/
index hidden folders=true
only basic indexing=true
balooctl disable
And restart
balooctl enable