@jkonecki We use the OSS version, I don't believe there is an enterprise one, just support.
When you create a new index you specify the number of shards (https://www.elastic.co/guide/en/elasticsearch/reference/current/indices-create-index.html)
This cannot be changed later, although moving data into new indexes is pretty trivial. Indexes are relatively cheap so you can create some really interesting structures. For example Kibana creates an index for each day, which makes dropping old data (or reducing the replicas on old data) really easy.
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