Where can I find a list of required mandatory fields? While trying get rid of summary field from the screen, I noticed I could not create the issue even if the summary field dissapeared from the create screen.
No. Neither can be removed.
Description can be made optional, and then removed from all screens and even hidden in the field configuration screen. Technically, it's still there, but practically, it's gone.
Summary is mandatory. End of story. You'd need to rewrite a chunk of the core code just to make it the same as Description.
Your only realistic option for summary is to fill it or generate it for the users (javascript tricks), and then minimise it's use. But, think about what an issue tracker does - the absolute total minimum is "task key + string to say what it is". Humans think in issue summaries, there's no real-life point in removing it. Re-use it instead, as the human description of the task.
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