sort option not working in search

When using the search query helper if you set the sort option using the enum generated you get an error like:
Query:
```
{
elastic(q: "hazelcast", limit: 3, sort:Id__raw__asc) {
hits { ... }
}
```
Response:
`"message": "Variable \"$_v1_sort\" got invalid value [{ Id.raw: \"asc\" }]; Expected type elasticSortEnum at value[0]."`

It seems that the lib convert the enum to string too early in the process and the graphql parser which expect an Enum get a String instead.