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  • karthikeya govindaraj senthil arumugam thinks this is interesting:

While indexing, replicas are only used as an additional place to store the data. When executing a query, by default, Elasticsearch will try to balance the load among the shard and its replicas so that they are evenly stressed. Also, remember that we can change this behavior; we will discuss this in the Understanding the querying process section of Chapter 3, Searching Your Data.

From

Cover of Elasticsearch Server Second Edition

Note

search queries in replica