Updating
TheHive update is simple. You only need to replace package files by new ones. If the schema of the data changes between the two versions, the first request to the application ask the user to start data migration (authentication is not required).
This process create a new index in ElasticSearch (suffixed by version of the schema) and copy all data on it (before adapting its format). It is always possible to rollback to previous version (but all modifications done on the new version will be lost).