MongoDB : Query documents by values in array

I have those documents :

{"_id" : 1, "actors" : [{"matricule" : "AVB", "name":"XXX"}, {"matricule" : "AVB", "name":"YYY"}]}
{"_id" : 2, "actors" : [{"matricule" : "PMH", "name":"FFF"}, {"matricule" : "BNG", "name":"HHH"}]}

I would like to get only the first document because it’s the same matricule but a different name.

I use this query :

{
 $expr:{$eq:["$actors.0.matricule", "$actors.1.matricule"]}
}

But it doesn’t work, I don’t have any results.
Do you know why ?

>Solution :

Try to use $arrayElemAt

db.collection.find({
  $expr: {
    $eq: [
      {
        "$arrayElemAt": [
          "$actors.matricule",
          0
        ]
      },
      {
        "$arrayElemAt": [
          "$actors.matricule",
          1
        ]
      }
    ]
  }
})

Here is the Mongo playground for your reference.