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Add new field to mongo document and set incremental values

var cursor = db.getCollection("FacetTest").find();

var i = 1;
cursor.forEach(function(x){
    db.getCollection("FacetTest").update({_id: x._id}, {$set:{Order: NumberInt(i)}}, {
     upsert: false,
     multi: false
    });
    i++;
});