Default Values For Faceting

I set default layout values for collection documents in my `_config.yml` file. I also want to use layout as an attribute for faceting. I used to be able to do this—However, I recently upgraded to the latest version of the gem (1.4.11) and this seems to no longer work. Looking at the dashboard in Algolia under facets—it says that layout is an unknown attribute.

Any thoughts on how I can add layout as an attribute for faceting?

Start by reproducing the behavior with the reported Jekyll _config.yml defaults and gem version 1.4.11, then trace how the layout value is sent to Algolia and recognized as a facet. Done means layout is accepted as a faceting attribute again, or the supported configuration and limitation are clearly documented.

Written by the indexing model from the issue text.