Cannot update a stored document that uses $ in the field names

[carolynvs]

I just tried to call store.Update and pass in a document that has a bundle definition. Bundles have some wonky fields like $comment and $id (from json schema) and I'm learning that while you can insert those documents into mongo, you cannot update those documents.

https://www.mongodb.com/docs/manual/core/dot-dollar-considerations/#std-label-crud-concepts-dot-dollar-considerations

Mongodb considers fields with $ prefixes to be instructions, not just field names.

We have a couple options:

• Customize the serialization of bundles to not use the $ so that we have the full/complete bundle definition
• Decide we don't care about id and comment when storing the bundle definition (that may not work though)
• Change the bundle field in the database to another type, and store the bundle as canonical json.

I'm going to try the third option and see if we can unobtrusively make this change before beta.1

[github-actions]

Closed by #2200.