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db.collection.update({"slots.slots":{$elemMatch:{_id:ObjectId("638455dee12f0122c98126a0")}}},{$set:{"slots.$[].slots.$[item].available":false,"slots.$[].slots.$[item].uid":"234235","slots.$[].slots.$[item].status":"booked"}},{arrayFilters:[{"item._id":ObjectId("638455dee12f0122c98126a0")}]})