{"logs": {"$exists": true, "$type": "array", "$not": {"$size": 0}}}

db.collection.find( { field: { $size: 2 } } );

{ myArrProp: { $size: 1 }}

db.collection.find( { field: { $size: 2 } } );

Check Configuration:

Open the /crons/config.php file and ensure the $whmcspath variable accurately reflects the full path to your WHMCS installation directory. 

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Match Paths:

Ensure the path in the cron job configuration on your server matches the path specified in the WHMCS configuration. 

{ "item.2": { "$exists": true } }