I'm failing terribly at adding a field to my search results.
The fields (external) name is "description" and is, to my knowledge, not custom made but out of the box.
The Webpart settings already contain the element , the XML output is correct but the tag is empty. Although the field is filled out on multiple files!
Upon further inspection, the internal name of the column appears to be "RoutingRuleDescription". Adding this to the webpart settings results in "Property doesn't exist or is used in a manner inconsistent with schema settings."