[docs] Document how to solve migrations failing with unknown saved object types #119944
Labels
docs
impact:high
Addressing this issue will have a high level of impact on the quality/strength of our product.
loe:small
Small Level of Effort
Team:Core
Core services & architecture: plugins, logging, config, saved objects, http, ES client, i18n, etc
v8.0.0
Starting in 8.0 Kibana will refuse to start if there are unknown saved object types present in the saved object indices #107678
We are informing users by logging a warning every time kibana starts on 7.16+ and surfacing this warning in the upgrade assistant. However, it would still be useful to explain this warning in more detail in https://www.elastic.co/guide/en/kibana/current/upgrade-migrations.html#preventing-migration-failures
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