ElasticSearch Migration: Migrating data necessary?

Technical assistance
1

Infos:

  • Used Zammad version: 5.2.1
  • Used Zammad installation type: (source, package, docker-compose, …): package
  • Operating system: Debian Bullseye
  • Browser + version: Firefox

Question

Is a migration of the ElasticSearch indexes necessary, or is all the data stored in the database and ElasticSearch is just used for the search, with the index fully re-buildable?
The docs at Migrate Zammad to new host — Zammad documentation and Restore — Zammad documentation
say nothing about data migration, but also don’t state that it’s not necessary

2

All useful data is in the DB unless you have modified the storage setting to store attachments on the FS, check the FULL_FS_DUMP setting to go about backing these up.

Indexes for Elasticsearch can be rebuilt from zero, no need to migrate
.
If you are really worried, do a test migration on a sandbox and see for yourself, but if you are migrating to a new host, i always keep a copy of the old host in case i missed anything.

Lastly, make sure to read the limitations and surrounding documents for backup/restore/migration.

I hope that helps.
Thanks
Robert

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