Baloo seems to be very fast at collecting files. However on a large file base with lots of often changing content the baloo_extractor takes quite an amount of system resources. For many use cases one often only need to quickly search by filename. Is it possible to configure baloo this way? E.g.: let it index all the filenames but do not extract any content (or only for a small range of files)?
add only basic indexing=true into [General] section of Your ~/.config/baloofilerc
Yes, abulak gave the way to do it using the config file. You can also turn it off in System Settings > Search > File Search > uncheck "Also index content"