Adding a new field to two billion documents

After migrating nearly 2billion documents I noticed I DERPED and forgot to set a field we call "mongo_id" on 90% of them.

Is there a way to update all of the documents so that

document.mongo_id =

Any update will require reindexing.

That is fine I suppose, do you happen to have an example query on how a field can be set to the value of a documents id?

POST indexname/doctype/_update_by_query
  "script": {
    "source": " = ctx._id",
    "lang": "painless"
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