Do we store these? I think it would be better to create an explicit document that represents the redirect, e.g:

```json
{
    "base_path:": "/old",
    "format": "redirect",
    "details": {
      "target": "/new"
    }
}
```

which would make redirected content still available in the content store (remembering that downstream API clients will need to be able to discover these, and update their local representations)