How to get all possible items(values) for field Edited

[Alexander]

 I get issued take id from it and in the 'schema' of the fields with the same id see that it has 'items', so as I understand it means that going to /rest/api/2/'items_value'/'id_of_value' should be stored the value.The problem is that I dont know that ids of the value.They don't begin from 1 or 0.How can I get them?