Help Request - Nodes aren't showing up in cluster formation

I’m trying to stand up a new OpenSearch instance using the RPM install method. I’m on Step 5 of the cluster formation documentation. When I execute the suggested _cat query:

curl -XGET https://<private-ip>:9200/_cat/nodes?v -u 'admin:admin' --insecure

I only see three of my twelve data nodes.

How do I troubleshoot this? Being new to OpenSearch in general, I’m unsure how to proceed.

I’ve solved this particular issue. Some of the data nodes had incorrect cluster UUIDs, so deleting the nodes’ data folders and letting them regenerate fixed the issue.

I found the issue by checking /var/log/opensearch/clusterName.log on one of the master nodes, and solved it with some help from here.