How do I query a document by a nested value in RethinkDB?

The ReThinkDB docs mention:

Documents can be filtered in a variety of ways—ranges, nested values, boolean conditions, and the results of anonymous functions.

Say I have:

{
  name: 'Joe'
  orders: [
    {
      id: 123456,
      date: '2016-01-19T09:12:48.898000+00:00'
    }
  ]
}

And I would like to retrieve users who have an order with id 123456 in their orders

Per the docs, I have tried using...

(long list of things cut out, now I've found the actual answer)

But I get no results.