Note: This post is based on Beta 2 and is subject to change in future releases.
3. Document ID assignment job (Work item that assigns Document ID to all items in the site collection.)
Note. To assign the document id to all documents within site collection you can run the job in Central Administration site-> Edit Time Job and click on “Run Now” button.
4. From this point all documents can be referenced using their “Document ID” via the following generic URL: