I use Display Templates for rendering ContentBySearchWebPart. Nice feature, but how I can add custom properties from search results list item into Display Template?

For example, I have a template, `some_listitem_template.html`:

```
<!--#_
var line1 = $getItemValue(ctx, "Line 1");
var line2 = $getItemValue(ctx, "Line 2");
var line3 = $getItemValue(ctx, "Line 3");

for (var p in ctx.CurrentItem)
{
    console.log(p + ":" + $getItemValue(ctx, p));
}

line1.overrideValueRenderer($contentLineText);
line2.overrideValueRenderer($contentLineText);
_#-->
<div class="news-date">_#= line3 =#_</div>
<div class="news-title">
   <a href="_#= linkURL =#_" title="_#= $htmlEncode(line1.defaultValueRenderer(line1)) =#_">_#= line2 =#_</a>
</div> 

```

And I have Property Mapping declaration string
`<mso:ManagedPropertyMapping msdt:dt="string">'Link URL':'Path','Line 1':'Title','Line 2':'Description', 'Line 3':'Created'</mso:ManagedPropertyMapping>`

But these properties (Description and Created) is always empty. Debug information from `console.log` show me that `ContextItem` has a pretty small collection of properties: 

```
Rank:0 
DocId:46734
Path:http://someurl/news/Page-1.aspx
Title:Some title
FileExtension:aspx
SecondaryFileExtension:aspx
OriginalPath:somepath
PartitionId:0c37852b-34d0-418e-91c6-2ac25af4be5b5
UrlZone:1
AAMEnabledManagedProperties:AttachmentURI;deeplinks;DefaultEncodingURL;ExternalMediaURL;HierarchyUrl;OrgParentUrls;OrgUrls;OriginalPath;ParentLink;Path;PictureThumbnailURL;PictureURL;PublishingImage;recommendedfor;ServerRedirectedEmbedURL;ServerRedirectedPreviewURL;ServerRedirectedURL;SiteLogo;SitePath;SPSiteURL;UserEncodingURL
RenderTemplateId:~sitecollection/_catalogs/masterpage/Display Templates/Search/Item_Default.js
QueryRuleId:00000000-0000-0000-0000-000000000000

```

Suppose its because Search Configuration, but where is this place exactly?