I am trying to map the start date of tasks to a managed property, which I can then use to display and sort the results.
Originally I was using an automatically generated field 'StartDateOWSDATE' which had the crawled property 'ows_q_DATE_StartDate' mapped to it. This returns an ISO date string no problem, however I can't use it to sort the results using SortList.
I've then tried mapping the same crawled property to both RefinableString01 and RefinableDate00, however these both just return an empty string in the search API.
This is a SharePoint Online environment which may restrict some configuration options and/or workarounds.