'Mongosh(shell) assign unique increasing number to every document

For the purpose of a product number, how can I assign an integer counting upwards starting with 001 to every document using mongo-shell?

As a results every document should have a unique "number" field. My starting point is of course using updateMany().

db.items.updateMany({}, {$set: {number: [xxx]}})
mongodbmongo-shell


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