[question] Elasticsearch version not supported by Graylog about charts HOT 6 CLOSED

I had no issues running the previous version of elasticsearch with graylog .. this downgrade unfortunately breaks elasticsearch.

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@jceb can you post more detail what errors you found?

Setting default to 7.10.2 is recommended version by Graylog (licensing issue). The helm-chart users are freely to set a new version if users do not have issue with the license.

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I had rolled out a version of the chart that installs a higher version of elasticsearch. After installing the current version the elasticsearch pod wouldn't change into running state complaining that the existing database is not compatible with the current version.

The solution for the issue is apparently to recreate the indices. I didn't want to do that and stopped the investigation here.

Is there a way to say the elasticsearch version so I can avoid reindexing, e.g. through values.yaml?

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You can't downgrade Elasticsearch. The Elasticsearch can only go forward.
I would suggest you to specify the Elasticsearch version in values.yaml then upgrade the release.

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Which property do I have to set in values.yaml to specify the elasticsearch version?

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The easiest way is set the dependency here https://github.com/KongZ/charts/blob/main/charts/graylog/Chart.yaml#L20
Alternatively, set elasticsearch.imageTag. Checkout elasticsearch documentation here https://github.com/elastic/helm-charts/tree/main/elasticsearch

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