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Use case
From time to time it happens that employees leave the company. One important thing to keep in mind is the period after the employee has left the firm where you should figure out how to proceed with his Jira data. One valid way could be to delete the user completely from the system. To not get into trouble when executing those operations, the following help can come in handy. It replaces all affected assignees and reporters so that everything keeps clean. Plus: Issue related users will be informed by a comment!
Manual trigger
Create a new rule and name it appropriately.
Providing a description will help you to identify what the rule does but this step is optional.
Add a Trigger → Manual
No further configuration needed. The rule will only be executed if a user hits the Execute button 
.
JQL Selector
Add Selector → JQL Selector
JQL Query*
Use the following Expression:
reporter = nnnnn
nnnnn has to be the user name.
Update field action
Next to the JQL Selector click on Add → Action → Update field
Field*
Choose Reporter
Update to*
Choose Selected value
Value*
Select the new reporter that should be set.
Add comment action
Underneath the Update field Action click on Add → Action → Add comment
Comment text*
Due to an employee leave the reporter has been automatically changed.
JQL Selector
Underneath the first SQL Selector click on Add → Selector → JQL Selector
JQL Query*
Use the following Expression:
assignee = nnnnn
nnnnn has to be the user name.
Assign issue action
Next to the second JQL Selector click on Add → Action → Assign issue
Assignee*
Choose one of the given options that fit most for you.
Add comment action
Underneath the Assign issue action click on Add → Action → Add comment
Comment text*
Due to an employee leave the assignee has been automatically changed.
Screencast
This is how the configuration above should look on your screen
