Does adding multiple shard replicas increase performance?

Currently we have one index with 5 shards and 1 replica per shard. is it possible to boost performance by increasing number of replicas or is it just fail-safe


It's both.

Thanks Mark. is there a thumb rule for determining the ideal set up ?

More than 0 if your data is important, is about it.

Anything else depends on how important the data is, the query speed, and more.

Increasing the number of replica shards generally affects query throughput more than latency, even though being able to utilise resources more efficiently across a cluster can have an impact on latency too.

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