This is pretty much the exact question here: https://answers.atlassian.com/questions/18812102
The problem is that the answer given there is wrong, as is mentioned by the initial poster.
checkLink = {link -> false} does NOT clear the Epic Link and I see no info in the documentation on how to do this. Googling it I only find the above question over and over again.
Note: I very much like the fact that the command above does not clear the Epic Link; it's good to separate all links from Epic Links. However, I'd like to know what I need to do to specifically clear just the Epic Link.
Any help please?