I have been asked to change Jira to notify users only when specific issue fields are updated. For example, instead of sending a notification when there's a change to any field (component, description, priority), users should be notified only if an issue's summary has been updated.
I've checked through the documentation on notifications and I've found that I can enable or disable notification for comments, changes to status or assignee, et cetera. There doesn't seem to be a way to scope the "Issue Updated" notification down to specific field(s). I've also investigated using a post-function in the workflow, but since a change to an issue's summary isn't necessarily part of a workflow transition a post-function wouldn't trigger.
I would suggest you to refer to this document and create IssueEventListener for all the events on the issue that you want to send emails. After this, please disable the standard notifications from JIRA so that it only uses your custom event listener.
There is also a feature request here : https://jira.atlassian.com/browse/JRA-31889. Vote on this issiue and add yourself as a watcher to this one.
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