Add node to existing elasticsearch cluster

I'm trying to add node to a running cluster. I've got this running elasticsearch cluster status by running

GET /_cluster/stats

i got the running cluster name is elasticsearch, and by following this adding node to cluster i've modified elasticsearch.yml into elasticsearch node-1
script.painless.regex.enabled: true

but seems nothing changes. are there any documentation about adding node into running cluster. Is it possible to do such this? Im running this poc because according to some articles online its hard to add node into a running cluster. Any responds or suggestions will be appreciated so much. Thank you

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