Description of problem:

If you omit "domain" when testing a POST to API command the error message prompts you for:

"interfaces.domain", but I think you should only be prompted for "domain".

If you search API reference /apidoc/v2/hosts/create.html it is not clear either.

You can see:
host[mac]
 host[domain_id]

 but no  host[domain]


Version-Release number of selected component (if applicable):

Version Satellite 6.2.6

Steps to Reproduce:
curl -H "Accept:application/json,version=2" -H "Content-Type:application/json" -X POST -u admin:password -k -d "{}" https://sat6-2.example.com/api/hosts | python -m json.tool


Actual results:

            "interfaces.domain": [
                "can't be blank"
            ],
            "interfaces.domain_id": [
                "can't find domain with this id"
            ],
            "interfaces.mac": [
                "can't be blank"
            ],


Expected results:

            "domain": [
                "can't be blank"
            ],
            "domain_id": [
                "can't find domain with this id"
            ],
            "mac": [
                "can't be blank"
            ],


Additional info: