System indices and number of replicas

I have a question about the number of replicas for system indices (Elasticsearch 7.5.x).

Standard number of shards = 1, number of replicas = 1.

Is it possible to change the number of replicas for system indices?

For example:

PUT /.kibana_1/_settings
{
    "index" : {
        "number_of_replicas" : 2
    }
}

return:

{
  "acknowledged" : true
}

but it doesn't work...

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Any idea?

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