heredocs and bash script to find the key and write respective in yml file?

[oslon]

cat << EOF > /etc/elasticsearch/elasticsearch.yml
cluster.name: MyCluster
node.name: mynode
path.data: /var/lib/elasticsearch
network.host: 0.0.0.0
EOF

The thing is that those cluster.name, node.name, path.data, network.host are already uncommented. So, I will be duplicating. Is there a way to find and replace those strings and append my values?

[requinix]

yq probably won't work since the lines are commented out, which more or less leaves you with the standard find-and-replace tactics using sed. Like

sed -i '/#cluster.name: MyCluster/s/#//g' filename.yaml