I'm currently working on migrating an index from ES 0.90 to ES 5.1, and logstash seems capable of streaming the index between the two clusters. However, the provided compatibility table only goes back to ES 1.0. What version of logstash is compatible with ES 0.90?
While unsupported, I believe that even the current version of Logstash would work with 0.90. There are some caveats to this. You should disable template management (manage_template => false), and some of the other features may not work properly, as they expect certain responses from Elasticsearch (429, for example), which I do not know if 0.90 provides. It's worth trying out just to make sure.
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