How can I index only active user accounts in a user index? I'm setting up Search API Solr to make a user search on my site. On this site, when a user account is cancelled, we keep the data but block the account (set the status to non-active). This is necessary to prevent abuse of the system, but I want to eliminate the risk that data from these accounts would be exposed in Solr search, so I am looking for a way to index only active users.

I've been digging around but couldn't find any way to configure the index to not add blocked users. How can I do this?
It turns out that Search API has a built-in filter for excluding unpublished nodes, but not users.

So here's a patch.