Attach Lookup Columns to document and document set content types using PowerShell

Below is the PowerShell code for adding user in Attach Lookups To Document And DocSet Content Types.
- Need to change some configure details in script.
- Need to chagne in CSV file like ContentType, SiteColumn and ColumnSetting.


Add-PSSnapin Microsoft.SharePoint.PowerShell -EA SilentlyContinue
Function CheckColumnExistsOnContentType{
Param($ContentType, $ColumnName)      
$Fields = $ContentType.Fields | ? {$_.InternalName -eq $ColumnName}
Write-Host $ColumnName $Fields
If($Fields -eq $Null){
Return $false
}
Else{
Return $true}      
}
 
    $SPSite = Get-SPSite -Identity http://serverName/
    $Web = $SPSite.RootWeb
    $Create = Import-Csv -path "C:\[location]\AttachLookupsToDocumentAndDocSetContentTypes.csv"
$Create
    ForEach($Row in $Create){
        $CT = $Web.ContentTypes[$Row.ContentType];
        $FieldAdd = $Web.Fields.GetFieldByInternalName($Row.SiteColumn)
  $ColumnExists = CheckColumnExistsOnContentType -ContentType $CT -ColumnName $FieldAdd
  if($ColumnExists -eq $True)
  {
   Write-Host "Attached Column" $FieldAdd.InternalName "to" $CT.name -ForegroundColor Cyan
   $FieldLink = New-Object Microsoft.SharePoint.SPFieldLink($FieldAdd)
   If($($_.'ColumnSetting') -eq "Hidden"){
    $FieldLink.Required = $false
    $FieldLink.Hidden = $true
   }
   ElseIf(($($_.'ColumnSetting') -eq "Required")){
        $FieldLink.Required = $true
   }
   Else{
       $FieldLink.Required = $false
   }
   $CT.FieldLinks.Add($FieldLink)
   $CT.Update($true)
   $Web.Update()
   $Web.Dispose()
   Write-Host " Column is added in Content Type" -ForegroundColor Green
  }
}