Grouping results should be sorted according to sort specification

[yngveaasheim]

Is your feature request related to a problem? Please describe. There is a limitation that grouping results within a group can be sorted only by the results of the rank profile specified for the query. That is, typically with '&ranking.profile=' or '&ranking='. This seems to be an un-necessary limitation and not a very good user experience.

Describe the solution you'd like It would be better if this could be generalised to use any ordering specified for the query, i.e., by the sort specification '&ranking.sorting=', or a YQL 'order by' statement.

Describe alternatives you've considered

Additional context