[PROD] Document(s) failed to index

[szabozoltan69]

Issue

In Sentry we can see more often this kind of index failure, mainly regarding to events, fieldreports and appeals.
Temporary a ./manage.py update_index can fix these failures, but we should find the long term solution for avoiding such error messages.
Search in Sentry: "failed to index"

[szabozoltan69]

Indexing 5 regions
Indexing 285 countries
Indexing 3759 districts
Indexing 6478 emergencies
Indexing 4034 appeals
Indexing 17082 field reports
Indexing 1650 Surge Alerts
Indexing 27 Emergency Response Units
Indexing 3800 Personnels
Indexing 2637 Projects
Indexing 416 drefs
Indexing 236 Dref Operational Updates
Indexing 416 Flash updates