as Raynard already said, Jira offers you a built-in post function in workflows called "Update Issue Field" that enables you to update a few system fields. Selecting the field "Resolution" and selecting the value "None" results in the field value to be cleared. Depending on the workflow you're already using in that project, it can be that simply transitioning the issue to OPEN again, will clear the Resolution field.
No answer here, this simply doesn't work to set the ticket back to an unresolved status.
My understanding of the Resolution field in Jira is that once any value is set for that field the ticket is considered closed and will show the strikethrough in reports and lists and those tickets will not be shown in the open ticket filter in the portal.
The problem I am seeing is that this post function doesn't set Resolution to NULL in the database. In my case it is setting it to the default value of Incomplete but again since there is a value in the Resolution field the system sees these tickets as closed.
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