Is it necessary to put "Discovery Seed_hosts[]" when working on a single node in elasticsearch 8.2?

is it necessary to put "Discovery Seed_hosts" when working on a single node in elasticsearch 8.2?

No, if you don't then it uses the default as mentioned at Discovery and cluster formation settings | Elasticsearch Guide [8.2] | Elastic;

The default value for discovery.seed_hosts is ["127.0.0.1", "[::1]"]

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