Apply the update that is described in the following Microsoft Knowledge Base (KB) article:
2598329 Description of the FAST Search Server 2010 for SharePoint hotfix package (Fsserver-x-none.msp): April 24, 2012
Enable custom security trimming on each FAST search node. To do this, run the following script in Windows PowerShell 2.0 by using administrator rights:
% customsecurity.ps1 –action enable
Note This script prompts you for the location of the AD LDS.
Configure the user profile synchronization service that connects to the Documentum content server. This action populates the AD LDS with group membership data from the Documentum content server. To do this, follow these steps: