SortScriptDescriptor doesn't include File property

[nickelbob]

There's a File property that you can specify so that you can use a locally saved copy of a script instead of specifying one in your query. This property is missing in the SortScriptDescriptor class.

More information on this property can be found here - http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/modules-scripting.html

[Mpdreamz]

Fixed by @nickelbob in #1250