Update fields in Sitecore for all items based on a specific Template in all languages using Powershell script – with Progress bar

UpdateFields.ps1

#Get all Product from the Master index for all languages. 
#You can change this to get data from specific language codes 
#like 'en', 'fr', etc.
$searchCriteria = @(
    @{ Filter = "Equals"; Field = "_language"; Value = "*"; }
    @{ Filter = "Equals"; Field = "_templatename"; Value = "Product"; }
)
 
#This script executes against Sitecore master index
$searchProps = @{
    Index = "sitecore_master_index";
    Criteria = $searchCriteria
}
 
#You can uncomment certain sections here to test your code 
#on just 10 items. 
#Use Expand "Fields" to see all the field values stored in the Sitecore Index.
$products = Find-Item @searchProps #-First 10 #| Select-Object -Expand "Fields"
 
#Total number of Product 
Write-Host "Product Count" $products.Count
 
$Stats = @{
        Total = $products.Count;
        ProcessCounter = 1;
        Success = 0;
        NotFound = 0;
    }
 
#Event disabler to make sure no events are triggered 
#You can avoid this if not required
New-UsingBlock (New-Object Sitecore.Data.Events.EventDisabler) {
        $products | ForEach-Object {
             
            $productItem = $_ | Initialize-Item
            $productTitle = $productItem.Fields["ProductTitle"].Value
            $Stats.Success++
             
            if($productTitle -ne $null -AND $productTitle.IndexOf("Karthik", 0, $productTitle.Length - 1) -ge 0)
            { 
                Write-Host "Updating Product Title for item '$($productItem.Name) - $($productItem.DisplayName)'. ( $($Stats.Success) / $($Stats.Total))"
                 
                $updatedProductTitle = $productTitle -replace "Karthik", "Keyan"
                $productItem.Editing.BeginEdit()  | Out-Null
                $productItem.Fields["ProductTitle"].Value = $updatedProductTitle
                $productItem.Editing.EndEdit() | Out-Null  
            }
             
            $percent = [int](($Stats.ProcessCounter * 100) / $Stats.Total)
            Write-Progress -Activity "Updating Product Title " -Status "$percent% Complete:" -PercentComplete $percent;
            $Stats.ProcessCounter++
        }
    }