In my cluster, I've found that by default every new index created with 1 shard and 1 replica; So I also changed default settings with 2 primary and 2 replica successfully for every new indices, which was found working properly later.
However, I’ve ended up with already got created .kibana index with 1 shard and 1 replica. So I tried to increase its replicas by using API calls as shown below.
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