Just wondering why elasticsearch still use that simple routing value approach for deciding which shard the data must be stored to. Actually this approach is limiting us to change the number of shards in the future. If elasticsearch uses an approach like consistent hashing (or even better technique), it can give us a chance to change the shard number in the future. Anyone have explanation or idea about this?
Why does elasticsearch still use simple routing value using modulo?
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As of Elasticsearch release 6.1.0, index splitting is possible. See release note: https://www.elastic.co/blog/elasticsearch-6-1-0-released.
The Split Index documentation actually explains why Elasticsearch doesn't use Consistent Hashing in more detail.