I've just completed three of the five weekly maps. Unfortunately, on Southsun Cove and Cursed Shore, I failed (like the rest of the players on those maps) to find a single rift.
When using the ability, a progress bar is visible, but no events occur when the search is complete:
1. No rift event is displayed on the map.
2. No visual direction is shown (ley lines pointing towards the rift).
3. No player even encounters the event randomly on the map.
In addition, I would like to note that when searching for rifts, there is often a situation when ley-lines appear, but the event is not displayed on the map.