A query for a person who unassigned tickets

[Noc32]

I am looking to create a query to find tickets which person X has unassigned tickets from. 

For example: Ticket A was assigned to Person A & then Person X unassigned Person A from Ticket A. 

Or where Person X has removed the sprint and /or the label and /or the epic from a certain ticket.

The summary of this is, I want to see how many tickets has Person X removed from their jurisdiction, so to say.

[Josh Costella]

Hi @Noc32 

You might be able to get most of the way there by using the CHANGED operator. But it has limited fields it can query. However, it does work for Assignee.

https://support.atlassian.com/jira-software-cloud/docs/jql-operators/#CHANGED

Your additional examples would need a plugin to enhance the search capabilities.