Upgrade from 2.1 to 5.x

Elastic Stack Elasticsearch
1

Hi All,

I am planning to upgrade from 2.1 to 5.x.

  1. I want to decide on 5.x version and I can see that 5.2.2 is the latest version available as of now. what are the factors that i need to consider on deciding a version in 5.x. can i directly go with 5.2.2 assuming it is best among 5.x versions?

  2. The migration plugin Elasticsearch Migration Helper v2.0.4 works with only 2.3.x and 2.4.x.
    Does this mean, i have migrate from 2.1 to 2.3.x (or 2.4.x) and then migrate from 2.3.x (or 2.4.x) to 5.x
    or can i directly migrate from 2.1 to 5.x
    How can i check with the help of migration helper if there are any issues with 2.1 to 5.x upgrade

https://www.elastic.co/guide/en/elasticsearch/reference/current/setup-upgrade.html

2

You need to upgrade to 2.4.4 before.

Otherwise you can use reindex from remote API to read the old cluster and reindex in the new one.

3

According to below link, it says remote reindex is required from 1.x to 5.x and doesnt specify reindexing for 2.x-5.x and only the migration plugin doesnt work with 2.1

https://www.elastic.co/guide/en/elasticsearch/reference/current/setup-upgrade.html

can any else clarify if remote reindexing is really required for upgrade from 2.1 to 5.x ?

4

It's not required.

5

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