We currently have a cluster of ES 1.7 nodes and Graylog 1.3 servers, we are looking to upgrade all of it to the latest version while retaining all the data. I have looked at the documentations for upgrading both. Although the ElasticSearch 2.3 upgrade seems pretty straight forward, it looks like it will require a whole cluster restarted. While at the same time, it will no longer be compatible with Graylog 1.3 after the upgrade. Similarly, if I upgrade/rebuild the Graylog servers with version 2.0, I am not sure if the indices in the ES cluster will be compatible at that point. So basically, I am not clear on how to tackle this. Can anyone provide some insight on what's the best way to do this?
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