As a side note to this, I’ve had some discussions with @rboulton around moving away from the concept of `indexable_content` altogether, in favour of having the search engine be aware of the different fields available for different formats, and how to index them. I don’t think it’s something we should force for the content store, but it does suggest storing it under the `details` key instead of as a top-level field in its own right, so we can quietly sweep it away if and when we don’t need it any more.