Are replica shards used when there is no failover?

Elastic Stack Elasticsearch
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I wonder if replica shards are used when a query is performed in order to load balanced between primaries and replicas or replicas ONLY comes into action when there is a fail in any primary?

thanks in advance.

2

Hi,
By default replica shard are used to compute search requests. If you are interested in more details about to control which replica should be used read here: https://www.elastic.co/guide/en/elasticsearch/reference/current/search-request-body.html#request-body-search-preference

Regards,
Simon

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Thank you very much

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