We are preparing to upgrade Elastic Search 1.7 to a newer version.
What we should be caring of before starting the upgrade, also is there any suggestions about the version that we should upgrade to it?
Is it technically possible to upgrade from 1.7 to 5.x or we should upgrade to 2.x first?
I would say it will depend on your use case. Given that both 2.x and 5.x have reached end-of-life and you therefore likely need to perform a full reindexing, I would recommend going to the latest 7.x release. There are quite a few videos on the Elastic website that might be useful.
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