The reason is that single node clusters will never replicate, because by design replication only happens on a different node (which doesn't exist in a single node cluster of one).
This means that the index health is always yellow because it cannot perform the replication.
Given that the instructions are for a single node deployment, it would be better to leave replication off and anyone who has a multi-node cluster can tune replication to their needs anyway.
By doing this we can have nice green index health in single node clusters :)
I have changed replicated shards from 1 to 0.
The reason is that single node clusters will never replicate, because by design replication only happens on a different node (which doesn't exist in a single node cluster of one).
This means that the index health is always yellow because it cannot perform the replication.
Given that the instructions are for a single node deployment, it would be better to leave replication off and anyone who has a multi-node cluster can tune replication to their needs anyway.
By doing this we can have nice green index health in single node clusters :)