ed for the Search Results WP. Use the same mappings as in the item template.
    var propertyMappings = "ListID,ListItemID,ContentTypeId,Link URL:Path,Property 1:Title,Property 2:,Property 3:,Property 4:,Property 5:,Property 6:,Property 7:,Property 8:,Property 9:,Property 10:,FileExtension,SecondaryFileExtension";
    if (!Srch.U.n(propertyMappings) && !Srch.U.w(propertyMappings)) {
        properties = Srch.Result.parsePropertyMappingsString(propertyMappings);
    }
}

AddPostRenderCallback(ctx, function()