I have been doing some research on adding shards and replicas after they have been created. It appears that replicas are no big deal. Use the API, and elasticsearch will distribute copies evenly across your cluster. In one article I read on nabble, adding a shard after the fact causes repartitio…

Changing number of shards and replicas for an existing index?

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Changing number of shards and replicas for an existing index?

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