Developer credits
Git commits in Moodle 3.1.9 by Sara Arjona
commit 54bb01439e84da58fb97ccf673eaca49b9c47ba6 Author: Sara Arjona <sara@moodle.com> Date: Mon, 30 Oct 2017 15:30:11 +0800 Tag: v3.1.9 MDL-60550 user: Add more restrictions in keyword searches