With the upgrade to CirrusSearch/Elastica for ElasticSearch 7.10, a few Flow codepaths are now referencing invalid Elastica libraries. This hasn't blown up in production because apparently Flow search was not deployed (or was undeployed?), see T76823: Basic search on Flow board (tracking) and T62493: StructuredDiscussions posts are not indexed in builtin search among others.
- Remove the undeployed code
- Adapt the undeployed code to the new version of Elastica
- Rewrite the Phan stubs to pretend that the old Elastica libraries exist
I'm in favor of option 1, given the status of Flow.