Does adding multiple shard replicas increase performance?

Elastic Stack Elasticsearch
1

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

Regards
Arnab

2

It's both.

3

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

4

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.

5

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.

6

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