we've got different versions of JIRA software (7.2 and 7.4), they tend to have different validators to transition, we want "a given custom field can not be empty" which is available in 7.2, but cannot be found in version 7.4 or 7.13, don't know if that's excluded in higher version or is it coming with a plugin.
is there a way to find out what validators are coming with by default? hope there's documentation to refer to.