Reset the content index in SharePoint Server 2010

1. Verify that the user account that is performing this procedure is a service application administrator for your FAST Search Content Search Service Application.
2. In Central Administration, in the Application Management section, click Manage service applications.
3. On the Service Applications page, in the list of service applications, click your FAST Search Content SSA.
4. On the Search Administration page, under Crawling, click Index Reset.
5. On the Search Service Application: Index Reset page, click Reset Now.
6. A confirmation dialog box appears; click OK to confirm the content index reset. The Search Service Application: Search Administration page opens and the System Status is displayed.

Before you start any new crawls, you must manually clear the content from the content collection your FAST Search Content Search Service Application was feeding to. The default collection name is sp. Note that clearing the content collection is irreversible.
To clear a FAST Search Server 2010 for SharePoint content collection, log onto the server that hosts FAST Search Server 2010 for SharePoint and follow this procedure.

Clear the content collection

1. Verify that you meet the following minimum requirements: You are a member of the FASTSearchAdministrators local group on the computer where FAST Search Server 2010 for SharePoint is installed.
2. On the Start menu, click All Programs.
3. Click Microsoft FAST Search Server 2010 for SharePoint.
4. Click the Microsoft FAST Search Server 2010 for SharePoint shell.
5. At the Microsoft FAST Search Server 2010 for SharePoint shell command prompt, type the following command:
Clear-FASTSearchContentCollection -Name <collection name>

Where:
<collection name> is the content collection you are about to clear.

Wait for the command to finish. This may take some time.