Downgrade 7.16.1 to 7.10

Hello Team,

We are in situation where we want to downgrade from7.16.1 to 7.10.2 , we are using Graylog 4 , Mongodb & Elasticsearch
Do I need to downgrade the whole stack, or can I downgrade partly?

Please guide,

Elasticsearch does not support downgrades, you will need to create a new cluster in 7.10.2 and reindex the data from your 7.16.2 cluster.

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Please note though that Elasticsearch 7.10 is now EOL and no longer supported.