Get Custom Field Contexts

Returns a [paginated](#pagination) list of [ contexts](https://confluence.atlassian.com/adminjiracloud/what-are-custom-field-contexts-991923859.html) for a custom field. Contexts can be returned as follows: * With no other parameters set, all contexts. * By defining `id` only, all contexts from the list of IDs. * By defining `isAnyIssueType`, limit the list of contexts returned to either those that apply to all issue types (true) or those that apply to only a subset of issu...