Delete Managed Properties in SharePoint 2013 Using PowerShell

#script reads from xml file to add crawled properties and managed properties
cls
#add sharepoint cmdlets
if ( (Get-PSSnapin -Name Microsoft.SharePoint.PowerShell -ErrorAction SilentlyContinue) -eq $null )
{
      Add-PsSnapin Microsoft.SharePoint.PowerShell
}
#get the XML file
[System.Xml.XmlDocument] $XmlDoc = new-object System.Xml.XmlDocument
$file = resolve-path(".\searchprop.xml")
if (!$file)
{
        Write-Host "Could not find the configuration file specified. Aborting." -ForegroundColor red
        Break
}
write-host "Parsing file: " $file
$XmlDoc = [xml](Get-Content $file)
#get the node containing the name of the search service application where you want to add properties
$sa = $XmlDoc.SearchProperties.ServiceName
$searchapp = Get-SPEnterpriseSearchServiceApplication $sa
#loop through crawled properties to check or add -- don't add if it already exists
$CrawledPropNodeList = $XmlDoc.SearchProperties.CrawledProperties
foreach ($CrawledPropNode in $CrawledPropNodeList.CrawledProperty)
{
    $SPCrawlProp = $CrawledPropNode.Name
    $SPCrawlPropType = $CrawledPropNode.Type

    #Create Crawled Property if it doesn't exist
    if (!(Get-SPEnterpriseSearchMetadataCrawledProperty -SearchApplication $searchapp -Name $SPCrawlProp -ea "silentlycontinue"))
    {
        switch ($SPCrawlPropType)
        {
        "Text" {$crawlprop = New-SPEnterpriseSearchMetadataCrawledProperty -SearchApplication $searchapp -Category SharePoint -VariantType 31 -Name $SPCrawlProp -IsNameEnum $false -PropSet "00130329-0000-0130-c000-000000131346"}
        "Integer" {$crawlprop = New-SPEnterpriseSearchMetadataCrawledProperty -SearchApplication $searchapp -Category SharePoint -VariantType 20 -Name $SPCrawlProp -IsNameEnum $false -PropSet "00130329-0000-0130-c000-000000131346"}
        "Decimal" {$crawlprop = New-SPEnterpriseSearchMetadataCrawledProperty -SearchApplication $searchapp -Category SharePoint -VariantType 5 -Name $SPCrawlProp -IsNameEnum $false -PropSet "00130329-0000-0130-c000-000000131346"}
        "DateTime" {$crawlprop = New-SPEnterpriseSearchMetadataCrawledProperty -SearchApplication $searchapp -Category SharePoint -VariantType 64 -Name $SPCrawlProp -IsNameEnum $false -PropSet "00130329-0000-0130-c000-000000131346"}
        "YesNo" {$crawlprop = New-SPEnterpriseSearchMetadataCrawledProperty -SearchApplication $searchapp -Category SharePoint -VariantType 11 -Name $SPCrawlProp -IsNameEnum $false -PropSet "00130329-0000-0130-c000-000000131346"}
        default {$crawlprop = New-SPEnterpriseSearchMetadataCrawledProperty -SearchApplication $searchapp -Category SharePoint -VariantType 31 -Name $SPCrawlProp -IsNameEnum $false -PropSet "00130329-0000-0130-c000-000000131346"}
        }
    }
}
#now that the crawled properties exist, loop through managed properties and add
$PropertyNodeList = $XmlDoc.SearchProperties.ManagedProperties
foreach ($PropertyNode in $PropertyNodeList.ManagedProperty)
{
    $SharePointProp = $PropertyNode.Name
    $SharePointPropType = $PropertyNode.Type
    $SharePointPropMapList = $PropertyNode.Map
    #add managed property
    #remove it if it already exists
    if ($mp = Get-SPEnterpriseSearchMetadataManagedProperty -SearchApplication $searchapp -Identity $SharePointProp -ea "silentlycontinue")
    {
         #$mp | Remove-SPEnterpriseSearchMetadataManagedProperty -Confirm
        $mp.DeleteAllMappings()
        $mp.Delete()
        $searchapp.Update()
    }

}