We generate certificates that are intended to be used for server authentication in a couple of places:

- `bin/elasticsearch-certutil http` command  ( See `CertGenUtils.generateSignedCertificate` in `HttpCertificateCommand` )
- TLS auto-configuraion for node startup ( see [`AutoConfigureNode`](https://github.com/elastic/elasticsearch/blob/814f7f9f52cb8c05db6465b9bfc818ea5d76c575/x-pack/plugin/security/cli/src/main/java/org/elasticsearch/xpack/security/cli/AutoConfigureNode.java#L454) )

In these cases we know that the certificate is meant to be used for server authentication, so we can set Extended Key Usage extension to `1.3.6.1.5.5.7.3.1`
x-pack/plugin/security/cli/src/main/java/org/elasticsearch/xpack/security/cli/HttpCertificateCommand.java
ipNames.clear();
            }
        }
        printHeader("Other certificate options", terminal);
        terminal.println("The generated certificate will have the following additional configuration");
        terminal.println("values. These values have been selected based on a combination of the");
        terminal.println("information you have provided above and secure defaults. You should not need to");
        terminal.println("change these values unless you have specific requirements.");
        terminal.println("");
        if (certName == null) {
            certName = dnsNames.stream()
                .filter(n -> n.indexOf('*') == -1)
                .findFirst()
                .or(() -> dnsNames.stream().map(s -> s.replace("*.", "")).findFirst())
                .orElse("elasticsearch");
        }
        X500Principal dn = buildDistinguishedName(certName);
        int keySize = DEFAULT_CERT_KEY_SIZE;
        while (true) {
            terminal.println(Terminal.Verbosity.SILENT, "Key Name: " + certName);
            terminal.println(Terminal.Verbosity.SILENT, "Subject DN: " + dn);
            terminal.println(Terminal.Verbosity.SILENT, "Key Size: " + keySize);
            terminal.println(Terminal.Verbosity.SILENT, "");
            if (terminal.promptYesNo("Do you wish to change any of these options?", false) == false) {
                break;
            }
            printHeader("What should your key be named?", terminal);
            if (csr) {
                terminal.println("This will be included in the name of the files that are generated");
            } else {