[Archivesspace_Users_Group] Index for Staff UI not updating (2.3.1)

[Seth Shaw]

In our testing of 2.3.1 no new resources are appearing while searching or
browsing (either from import or manually using the Staff UI). If a resource
has an Agent added it doesn't appear in that Agent's list of related
resources. However, all these additions and changes are reflected in the
database and resources created before the upgrade still appear in searches

Forcing a reindex by deleting "data/indexer_state/" doesn't have any effect.

The logs only show one related error that appears during the startup
sequence (see attached for the relevant section of the log).

Any ideas?
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