Document URL: 

Administration guide;
Plug-in guide;
Command and configuration guide. 

Describe the issue: 

New plugin was added - addn. 
This plugin allows a unique entry that matches some filter
to bind with "user1" -> "uid=user1,ou=People,dc=example,dc=com".

For the user to bind:
* Only a single entry may be mapped from the filter, else it is considered a failure.
* The entry must belong under a specific suffix
* The user@domain.com maps the domain to a subconfig which maps to a suffix
  to search underneath.

https://fedorahosted.org/389/ticket/48272 bz1266206