Episerver Search Service Sort Order

Hi,

We are currenlty working on using the default Episerver Search and we have a problem with sorting the search results.

We are following the documentation found here :https://world.episerver.com/documentation/developer-guides/CMS/search/Search-integration/

However there is no mention of a SortQuery option. 

Does anyone know if this is possible?

We would like to order the results by PublishedStartDate if possible.

Thanks

Paul