It seems like the update just happens automagically, but you have control over this yourself. The update is being triggered by a post function on the transition that is applied to close your story/sub-story.
If you want the same thing to take place for Change Requests, first have a look at the workflow that is currently assigned to Change Requests. That's the workflow you need to check and potentially optimize.
To edit the workflow, type g+g and type 'workflows' in the dialog that pops up.
Find the workflow and select edit.
Select the transition that closes the issues and navigate to post functions
If it isn't there yet, add a post function of type Update issue field. Configure it to update the value of the Remaining Estimate field to 0.
Don't forget to publish the workflow once you're done
And like this the remaining estimate on change requests will be updated to 0 when you close them.
Just on a side note: before you modify your workflow, have a look whether it is being used for other issue types / projects as well. Your change will affect all issues that are using the workflow throughout JIRA. Which is probably ok, but a prior assessment of the impact of your change is never a bad idea.
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