Recently, I got into a situation where we needed to clear the Fast search index. Here are the steps that I took to accomplish.

1) Logon to Central Administration –> Application Management –> Manage Service Application –> Fast Query SSA. On the left hand navigation, click on the Index Reset. Then click on the button “Reset Now”. Well, you would think that this should do it. Right. Look for step 2.

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Step 2) Go to Start –> Programs –> Fast Search-> Fast Search Shell (Powershell for FastSearch), right click and run as administrator.

Execute the following command.
Get-FASTSearchContentCollection

This will get you the search content collection that you need to clear. Notice the name which you will need to the run the step 3 command.

Step 3) Execute the following powershell cmdlet.

Clear-FASTSearchContentCollection -Name nameofContentCollection –Force

That’s it!! Enjoy!