GPA indexes GPOs in Active Directory periodically according to a schedule you set.
To set indexing properties for a domain:
In the left pane of the GPA Console, expand GP Explorer to the domain where you want to set indexing properties.
Right-click the domain and click Properties.
In the Domain Properties window, click Indexing Settings tab, then select the option to include the domain for indexing and set the schedule you want in Index Schedule.
If you want to delete current indexes and completely rebuild them, click Rebuild Indexes.
If you want to update current indexes outside the configured schedule, click Update Indexes.
If indexing was in progress when you opened the window, click Refresh to update the status area.
Click OK.