I know this one is really old, but I just came up with a workaround since this is still not possible in 6.3.x and possibly later. Assuming that all issues in query are in the "Closed" status:
You may need to make adjustments to this depending on how many statuses and workflows are involved.
We have released Bulk Operation Enhancer For Jira plug-in in marketplace.
You could do bulk operations like additive adding, replacing and removing labels.
You could also set Resolution field with Bulk Operations.
Documentation is here: http://www.confluence.kostebekteknoloji.com/display/PLUG/Bulk+Operation+Enhancer++for+JIRA
You can also contact with firstname.lastname@example.org for your new bulk operation suggestions
another way, check the following document to bulk edit resolutions
some one already raised an issue with atlassian
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