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Use an ID card identification number or a generated ID from MongoDB to identify users?

I am developing a schema for a simple MongoDB database where there will be a collection for clients.

A natural way to identify a client will be to use their identification number (6 numbers and a letter unique to each person in the country). Another way to do this is to let MongoDB select the value of the _id field and use the map identifier as another field.

Any suggestion on the advantages / disadvantages of selecting a single line with 6 numbers and a letter like _id or a choice and ObjectId created by Mongo?

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