Since it's not possible to make a bulk edit on a resolution field without any plugin (to my knowledge atleast) you need to do a workaround to accomplish this. This is what I found in this thread: https://community.atlassian.com/t5/Jira-questions/Bulk-change-quot-Resolution-quot-field/qaq-p/256191
Hope that solves your issue! :-)
Can you explain in more detail what you need?
You need to change the resolution of your issues or you want to transition them to Resolved?
If you want to transition them just use bulk edit.
You need a global transition for that.
Go to issues -> search for issues -> find all the issues with status Closed and in the top right corner you will find -> tools -> bulk edit.
One note make sure that during the process you uncheck "send a notification for this transition" unless you really want to.
Atlassian documentation on bulk edit.
Also if the resolution is the problem please check this
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