assignee was admin
where "admin" is the user.
/edit: If you want to find all issues that have ever been assigned to anyone, you could use
assignee != NULL OR assignee changed
It would be nice if this worked with was in membersOf("") as well so you can do this for a group; but it doesn't seem to work even though it lists membersOf as one of the choices for 'was in' (btw, membersOf works fine for the same group when I just use "in") so I know the group and the syntax are legit.
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