Content differences:
--- /etc/opensearch/production-elk7-codfw/opensearch.yml.orig
+++ /etc/opensearch/production-elk7-codfw/opensearch.yml
@@ -92,21 +92,23 @@
transport.tcp.port: 9300
#
# --------------------------------- Discovery ----------------------------------
+# See also # https://docs.opensearch.org/2.19/tuning-your-cluster#step-4-configure-discovery-hosts-and-initial-cluster-manager-nodes-for-a-cluster
#
# Pass an initial list of hosts to perform discovery when this node is started:
# The default list of hosts is ["127.0.0.1", "[::1]"]
#
#discovery.seed_hosts: ["host1", "host2"]
-#
-# Bootstrap the cluster using an initial set of master-eligible nodes:
-#
-#cluster.initial_master_nodes: ["node-1", "node-2"]
-#
+discovery.seed_hosts: ["logging-hd2001.codfw.wmnet", "logging-hd2002.codfw.wmnet", "logging-hd2003.codfw.wmnet", "logging-hd2004.codfw.wmnet", "logging-hd2005.codfw.wmnet", "logging-sd2001.codfw.wmnet", "logging-sd2002.codfw.wmnet", "logging-sd2003.codfw.wmnet", "logging-sd2004.codfw.wmnet", "logging-sd2005.codfw.wmnet", "logging-sd2006.codfw.wmnet", "logging-sd2007.codfw.wmnet", "logstash2033.codfw.wmnet", "logstash2034.codfw.wmnet", "logstash2035.codfw.wmnet", "logstash2036.codfw.wmnet", "logstash2037.codfw.wmnet"]
+
+# Bootstrap the cluster using an initial set of cluster-manager-eligible nodes:
+
+#cluster.initial_cluster_manager_nodes: ["node-1", "node-2"]
+cluster.initial_cluster_manager_nodes: ["logging-hd2001.codfw.wmnet", "logging-hd2002.codfw.wmnet", "logging-hd2003.codfw.wmnet", "logging-hd2004.codfw.wmnet", "logging-hd2005.codfw.wmnet", "logging-sd2001.codfw.wmnet", "logging-sd2002.codfw.wmnet", "logging-sd2003.codfw.wmnet", "logging-sd2004.codfw.wmnet", "logging-sd2005.codfw.wmnet", "logging-sd2006.codfw.wmnet", "logging-sd2007.codfw.wmnet", "logstash2033.codfw.wmnet", "logstash2034.codfw.wmnet", "logstash2035.codfw.wmnet", "logstash2036.codfw.wmnet", "logstash2037.codfw.wmnet"]
+
# Set to ensure a node sees N other master eligible nodes to be considered
# operational within the cluster. Its recommended to set it to a higher value
# than 1 when running more than 2 nodes in the cluster.
#
-discovery.zen.ping.unicast.hosts: ["logging-hd2001.codfw.wmnet", "logging-hd2002.codfw.wmnet", "logging-hd2003.codfw.wmnet", "logging-hd2004.codfw.wmnet", "logging-hd2005.codfw.wmnet", "logging-sd2001.codfw.wmnet", "logging-sd2002.codfw.wmnet", "logging-sd2003.codfw.wmnet", "logging-sd2004.codfw.wmnet", "logging-sd2005.codfw.wmnet", "logging-sd2006.codfw.wmnet", "logging-sd2007.codfw.wmnet", "logstash2033.codfw.wmnet", "logstash2034.codfw.wmnet", "logstash2035.codfw.wmnet", "logstash2036.codfw.wmnet", "logstash2037.codfw.wmnet"]
#
# For more information, consult the discovery and cluster formation module documentation.
#