* @throws IOException
*/
private String forceClassNameExtraction(int scoreDocIndex) throws IOException {
Map<String, FieldSelectorResult> fields = new HashMap<String, FieldSelectorResult>( 1 );
fields.put( DocumentBuilder.CLASS_FIELDNAME, FieldSelectorResult.LOAD_AND_BREAK );
MapFieldSelector classOnly = new MapFieldSelector( fields );
Document doc = queryHits.doc( scoreDocIndex, classOnly );
return doc.get( DocumentBuilder.CLASS_FIELDNAME );
}