Update Level

$mp = Get-FASTSearchMetadataManagedProperty -Name <ManagedProperty>
$mp.GetFullTextIndexMappings()
$fuu = Get-FASTSearchMetadataFullTextIndexMapping|Where-Object {$_.ManagedProperty.Name -eq “<ManagedProperty>”}
Remove-FASTSearchMetadataFullTextIndexMapping -Mapping $fuu
New-FASTSearchMetadataFullTextIndexMapping –ManagedProperty (Get-FASTSearchMetadataManagedProperty Body) –FullTextIndex (Get-FASTSearchMetadataFullTextIndex content) –Level <ImportanceLevel>