How can I search epics in next gen projects?

[nelson]

I have set up a next gen project and I cannot find a way to do a search cross projects since the epics do not seem to be epics in the search. Also, I've set up a custom field checkbox and I cannot find a way to use it for filtering in search. All the document I found is for classic projects.

How can I use JQL or do advanced searches in next gen projects?

[Vera Henrichs]

And how about this? 

https://jira.atlassian.com/browse/JRA-59992 

Please vote for it, thanks!