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69b78f7f8a
The introductory sections of the reference manual contains some simplified instructions for adding a node to the cluster. Unfortunately they are a little too simplified and only really work for clusters running on `localhost`. If you try and follow these instructions for a distributed cluster then the new node will, confusingly, auto-bootstrap itself into a distinct one-node cluster. Multiple nodes running on localhost is a valid config, of course, but we should spell out that these instructions are really only for experimentation and that it takes a bit more work to add nodes to a distributed cluster. This commit does so. Also, the "important config" instructions for discovery say that you MUST set `discovery.seed_hosts` whereas in fact it is fine to ignore this setting and use a dynamic discovery mechanism instead. This commit weakens this statement and links to the docs for dynamic discovery mechanisms. Finally, this section is also overloaded with some technical details that are not important for this context and are adequately covered elsewhere, and completely fails to note that the default discovery port is 9300. This commit addresses this.