Here is how we can bulk close JIRAs
Step 1: Search all the issues/stories you wan to close (Using JQL or predefined filter of your own), something like below.
Step 3: Choose Operation, Since we are closing, we need to select transition issues and go to next.
Step 4: Choose the operation from available workflow actions
Step 5: Here I have choosed Resolved as i am closing these issues.
Step 6: Select Resolved and proceed further.
Step 7: Add comments (optional) and choose resolution
Step 8: Choose confirm to bulk close all the tickets.
Easy right!!