Is my understanding right that if i have a cluster of three identical data-nodes an index should have three shards and one replica for best search performance (parrallel processing on each node) ?
And then when doing horizontal scaling to nine data-nodes. Do i get best performance by adding one additional replica (three shards and two replica) ?
It depends a lot:
There is no magic rule, the good approach is to start simple, monitor every thing (CPU, RAM, Java heap...) and find the good point for your usage.
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