Like mentioned in at least one of your other post (Aggregate with filters - #2 by steevej ),
Please update your post after reading
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Your collaboration will be appreciated by all.
Now with your current issue at hand.
Please provide more details about which documents. Top level documents of the collection or documents inside the productos array? If not all documents of either please indicate what is the criteria you want to limit the documents for which to apply.
For example:
db.a.updateMany( { "productos.idOrigen" : 8 } ,
{ "$set" : { "productos.$.new_oid" : new ObjectId() }})
will add the field new_oid as an object id to the first element of productos array of all the top level documents which as the field idOrigen equals 8. Top documents will then looks like
{ _id: ObjectId("66323759fabac22b5c9aa33e"),
productos: [ { idOrigen: 8, new_oid: ObjectId("663237d0fabac22b5c9aa33f") } ] }