We started with Elasticsearch back in its 0.x releases. Fortunately the project thrived and has proven very popular. Many of our customers are using it independently, unrelated to Caringo Swarm.
"Searchable snapshots is one of Elasticsearch biggest features that came out in the last few years."
--Shay Banon, creater of elasticsearch
Upgrading Elasticsearch 6 => 7
Btw I'm using Caringo Demo Containers because it's easy and I can run a
realistic environment all on my laptop. Just tweaked a bit to use
systemd so I can demo the simple in place upgrade:
Verify it's at Elasticsearch 6
Note Caringo that Swarm supports only 7.5.2 at this time due to a minor compatibility issue. Support for 7.10 should come soon in 2021. It will be another simple in-place upgrade.
Elasticsearch, like most databases today, can make snapshots to and restore from object storage.
Now to create a new Elasticsearch 7.10. Note this is totally independent of the 7.5.2 cluster from where a snapshot was made to Caringo Swarm at http://backup42.