Set a PropertyBag property as Indexable (Queryable via Search) using CSOM + Powershell

Set an PropertyBag property as Indexable (Queryable via Search) using CSOM + Powershell.ps1

function Set-PropertyBag {
    param (
        [string]$PropertyName,
        [string]$PropertyValue = $null,
        [bool]$Indexable = $false,
        [Microsoft.SharePoint.Client.Web]$Web,
        [Microsoft.SharePoint.Client.ClientContext]$ClientContext
    )
    process {
            $indexedPropertyBagKey = "vti_indexedpropertykeys"
            if($Indexable) {
                $ClientContext.Load($Web.AllProperties)
                $ClientContext.ExecuteQuery()
                $oldIndexedProperties = $Web.AllProperties.FieldValues[$indexedPropertyBagKey]
                if($oldIndexedProperties -ne $null) {
                    $oldIndexedProperties = $oldIndexedProperties.ToString()
                } else { 
                    $oldIndexedProperties = "" 
                }

                $propertyNameBytes = [System.Text.Encoding]::Unicode.GetBytes($PropertyName)
                $encodedPropertyName = [Convert]::ToBase64String($propertyNameBytes)
        
                if($oldIndexedProperties -notlike "*$encodedPropertyName*") {
                    $Web.AllProperties[$indexedPropertyBagKey] = "$oldIndexedProperties$encodedPropertyName|"
                }
            }

            $Web.AllProperties[$PropertyName] = $PropertyValue
            $Web.Update()
            
            $ClientContext.Load($Web)
            $ClientContext.Load($Web.AllProperties)
            $ClientContext.ExecuteQuery()
    }
}