SELECT EventIndex,Time,EntryType,Source,InstanceID
FROM OpenExchangePSQuery(
    POWERSHELL, '
    $TimeAgo = (Get-Date).addMinutes(-1)
$servers = "ex-dag1","ex-dag2","ex-dag3","ex-cshb1","ex-cshb2"
 
foreach ($server in $servers)
{
    $events = Get-EventLog "application" -computername $server -after $TimeAgo
 
    foreach ($event in $events)
    {
        $event | select @{Name="EventIndex"; Expression = {$_.Index}},Time,EntryType,Source,InstanceID
    }
}
              ', POWERSHELL
)