I just updated Apache Solr Search module to 7.x-1.4 version, and since then the facets are missing in the assigned region.
Facets of all taxonomy terms are missing, the rest of the default facets like content type, etc are appearing on the settings page.
Plus the Taxonomy term fields are missing under Bias settings as well.
I have tried to disable > Uninstall > re-install all the Apache solr search and Acquia search modules but Facts are not appearing back on the Apache Solr Settings page.
I have this issue on the production server.