Getting Error - UDM Search

I am running the following UDM search:

$e.metadata.vendor_name != ""
$log_type = $e.metadata.vendor_name
match:
$log_type
outcome:
$count = count($e.metadata.id)
 
Getting following error: ERROR: Search has encountered an error and could not load data. Please try again, and contact support if this error continues.
 
Please help
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