How to configure tracker-extract so it has a higher nice value?

I suffer each time I return from a pause and I find my desktop stalled because the priority of tracker-extract consumes too much CPU (sometimes 104%), so I have to kill thru terminal the task (tracker-miner-fs, tracker-extract, and tracker-store) in order to return to my regular desktop activities.

I understand the importance of this program, but I do not want to solve its niceness issue every time by hand. And I do not want to remove it definetely.

Is there a configuration file so I can set it to my personal taste (I will choose a higher value so it really executes on a low priority level)?

Thanks

Tracker's settings are now on dconf database, Managed through dconf-editor (GUI) or gsettings (CLI) under the org.freedesktop.Tracker.* tree:

For Ubuntu 16.04, you could set indexing to run in the background with tracker-preferences. If that command wasn't already installed, you could install it with sudo apt install tracker-gui

After its initial complete index run, tracker — at least on a machine with SSD storage that isn't receiving huge dumps of new files — shouldn't take a significant time to run. If you find that tracker has locked up, I have suggested a solution here.