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[DOC] Update cluster formation setting name and description (#5712) 

* Update setting name and add cluster manager nodes setting to step 4

Signed-off-by: Melissa Vagi <vagimeli@amazon.com>

---------

Signed-off-by: Melissa Vagi <vagimeli@amazon.com>
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Melissa Vagi 2023-12-05 09:13:36 -07:00 committed by GitHub
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14
_tuning-your-cluster/index.md
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@ -18,7 +18,7 @@ To create and deploy an OpenSearch cluster according to your requirements, it’
There are many ways to design a cluster. The following illustration shows a basic architecture that includes a four-node cluster that has one dedicated cluster manager node, one dedicated coordinating node, and two data nodes that are cluster manager eligible and also used for ingesting data.
The nomenclature recently changed for the master node; it is now called the cluster manager node.
The nomenclature for the master node is now referred to as the cluster manager node.
{: .note }
![multi-node cluster architecture diagram]({{site.url}}{{site.baseurl}}/images/cluster.png)
@ -135,13 +135,19 @@ network.bind_host: <IP address of the node>
Make sure to configure these settings on all of your nodes.
## Step 4: Configure discovery hosts for a cluster
## Step 4: Configure discovery hosts and initial cluster manager nodes for a cluster
Now that you've configured the network hosts, you need to configure the discovery hosts.
Now that you've configured the network hosts, you need to configure the discovery hosts and specify the cluster manager nodes for the initial cluster election.
For example, the setting looks like the following:
```yml
cluster.initial_cluster_manager_nodes: ["opensearch-cluster_manager"]
```
Zen Discovery is the built-in, default mechanism that uses [unicast](https://en.wikipedia.org/wiki/Unicast) to find other nodes in the cluster.
You can generally just add all of your cluster-manager-eligible nodes to the `discovery.seed_hosts` array. When a node starts up, it finds the other cluster-manager-eligible nodes, determines which one is the cluster manager, and asks to join the cluster.
You can generally add all of your cluster-manager-eligible nodes to the `discovery.seed_hosts` array. When a node starts up, it finds the other cluster-manager-eligible nodes, determines which one is the cluster manager, and asks to join the cluster.
For example, for `opensearch-cluster_manager` the line looks something like this: