Is sorting possible on search_as_you_type field

Elastic Stack Elasticsearch
1

I have mapped my product/category titles to search_as_you_type fields. When I try to sort by those fields I get this error:

"error": {

        "root_cause": [

            {

                "type": "illegal_argument_exception",

                "reason": "Fielddata is not supported on field [name] of type [search_as_you_type]"

            }

        ],
2

You can't sort on such a filed.
You need to define a subfield of type keyword and sort on that one.

3

I tried creating a keyword subfield of search_as_you_type field but it would not stick, then I found a Github issue which proposes creating a text field with two subfields(search_as_you_type and keyword) and that seems to go with ES.
So this is my workaround for now, thanks.