In theory, it shouldn’t be very complicated to facet by datasource or item language of Search API items – we just need to figure out, what steps are needed exactly to get this working.
Needs work
2.0
Search API integration
The change is currently missing an automated test that fails when run with the original code, and succeeds when the bug has been fixed.
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It's likely this issue predates Contrib.social: some issue and comment data are missing.