$class = cimclass MSFT_TaskEventTrigger root/Microsoft/Windows/TaskScheduler
$trigger = $class | New-CimInstance -ClientOnly
$trigger.Enabled = $true
$trigger.Subscription = '<QueryList><Query Id="0" Path="Application"><Select Path="Application">*[System[Provider[@Name=''Microsoft-Windows-Search-ProfileNotify''] and EventID=2]]</Select></Query></QueryList>'

$ActionParameters = @{
    Execute  = 'C:\Windows\system32\WindowsPowerShell\v1.0\powershell.exe'
    Argument = 'Restart-Service WSearch'
}

$Action = New-ScheduledTaskAction @ActionParameters
$Principal = New-ScheduledTaskPrincipal -UserId 'NT AUTHORITY\SYSTEM' -LogonType ServiceAccount
$Settings = New-ScheduledTaskSettingsSet

$RegSchTaskParameters = @{
    TaskName    = 'Reset Windows Search'
    Description = 'Workaround Windows Server 2019 Search index glitch'
    TaskPath    = '\Event Viewer Tasks\'
    Action      = $Action
    Principal   = $Principal
    Settings    = $Settings
    Trigger     = $Trigger
}

Register-ScheduledTask @RegSchTaskParameters