Currently, there is no JQL command that allows user to search for issues from previously close sprints, for example: 

• As an user, I would like the ability to conduct search for issues that were part of the past 6 sprints for a specific project, so that I may obtain trending information.
• As an user, I would like the ability to search for items that was part of a sprint that was completed 15 sprints ago relative to the currently active sprint.

Thank you.