Creates a shortcut or link to a document (file, folder, or existing shortcut) with a given unique key. The parentFolderUniqueKey defines the folder where the shortcut will be created. The unique key of the resulting shortcut (type of document record) is returned.
protected DocumentRepository documentRepository;
//the first parameter, documentUniqueKey, identifies an existing document to create a link to
//the second parameter, parentFolderUniqueKey, identifies the folder where the shortcut will be created
String uniqueKey = documentRepository.createShortcut("DOCU_1451", "DOCU_1771");