ERROR: Unsupported Elasticsearch version: 2.0.0 when using opensearch 2.9

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1. Describe your incident:

I am trying to upgrade a graylog cluster from elasticsearch to opensearch 2.9.0

2. Describe your environment:
opensearch 2.9.0

  • OS Information:
    CentOS 7

  • Package Version:
    graylog-server-4.2.13-1.noarch

  • Service logs, configurations, and environment variables:
    ################################################################################

ERROR: Unsupported Elasticsearch version: 2.0.0

Please see the following link(s) to help you with this error:

Need further help?

Terminating. :frowning:

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3. What steps have you already taken to try and solve the problem?

I upgraded graylog from 4.2 to 5.1.
I pointed to a brand new opensearch cluster (I’m okay with it deleting old indexes that are not found).

4. How can the community help?
Is this a supported version of opensearch? Is it too new?

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Can you share the full server.log?

Can you also share your server.conf file? (be sure to redact the admin password and password secret)

I suspect there may be something left behind in the server.conf for graylog but its difficult to know for certain without seeing it.

I can validate that graylog does run without issue with OpenSearch 2.9 as I am using that for my lab and have confirmed reports from others using it as well.

I solved this. I upgraded some of the nodes in my cluster to 5.1 but some got missed, and were still on 4.2

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