Possibly, but you really don't want to do it with validators.
You should only do things that make changes in transitions during post-functions (or listeners that happen even later). Validators are totally the wrong place.
So, the question is - what do you want to do when the issue moves to complete?
That's another requirement again. The best way to do that is in a "condition", as that would stop the user starting the process to change the status.
However, neither conditions or validators can be scripted on Cloud yet. So I don't think there's any way to do this.
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