Find Sitecore items by ancestor template

FindItems.ps1

# Searches for Sitecore items in Master database that descend from a given template, sit
# underneath a particular ancestor item, and are the latest version.

class TemplatesSearchResultItem : SearchResultItem
{
   # For items contained within an SXA index try using the name "inheritance_sm".
   [Sitecore.ContentSearch.IndexField("_templates")]
   [System.Collections.Generic.List[ID]]$TemplateIds
   
   [Sitecore.ContentSearch.IndexField("_latestversion")]
   [bool]$IsLatestVersion   
}

$rootItem = [ID]::Parse("{DD423562-0AFE-4745-A0BF-F853D180CE5F}")
$templateId = [ID]::Parse("{8812E8B0-AE25-44C2-B0FF-6EE3D1656F25}")

$props = @{
    Index = "sitecore_master_index"
    Where = "IsLatestVersion == @0 And Paths.Contains(@1) And TemplateIds.Contains(@2)"
    WhereValues = $True, $rootItem, $templateId
    QueryType = [TemplatesSearchResultItem]
}

Find-Item @props | Initialize-Item | %{

    Write-Host $_.Paths.FullPath
    
%}