Headless or GUI

Setting up an Elastic Cluster using Rocky Linux 9. I have three servers planned to start. 1 Elasticsearch, 1 Kibana, 1 Logstash. The question I can’t find an answer to is do I need to install Rocky Server with GUI on any of these or can I install them all without a GUI (headless)?

Headless is better.

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Thank you! I couldn't find this anywhere on the install docs.