So here are some ideas
I decided for First method
1. Legal way to block searcher
Go to KDE System Settings > Desktop Search > click plus sign and add your home to excluded folders.
You need to log out or reboot or run the script below to stop the current indexer!
2. More intrusive version create kill script to run at KDE start-up
vi BalooStop.sh
#!/bin/bash
killall -9 baloo_file_cleaner
killall -9 baloo_file
killall -9 baloo_file_extr
#rm -rf ~/.local/share/baloo/*
./BalooStop.sh
3. More hakish way create symlinks to /bin/true
mv /usr/bin/baloo_file_extractor /usr/bin/baloo_file_extractor.orig; ln -s /bin/true /usr/bin/baloo_file_extractor
mv /usr/bin/baloo_file_cleaner /usr/bin/baloo_file_cleaner.orig; ln -s /bin/true /usr/bin/baloo_file_cleaner