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/AutoConfigureNode.java
certificatePrincipal,
                getSubjectAltNames(env.settings()),
                httpKeyPair,
                httpCaCert,
                httpCaKey,
                false,
                HTTP_CERTIFICATE_DAYS,
                SIGNATURE_ALGORITHM
            );
            
            
            fullyWriteFile(
                tempGeneratedTlsCertsDir,
                HTTP_AUTOGENERATED_CA_NAME + ".crt",
                false,
                inReconfigureMode ? ELASTICSEARCH_GROUP_OWNER : null,
                stream -> {
                    try (
                        JcaPEMWriter pemWriter = new JcaPEMWriter(
                            new BufferedWriter(new OutputStreamWriter(stream, StandardCharsets.UTF_8))
                        )
                    ) {
                        pemWriter.writeObject(httpCaCert);
                    }
                }
            );
        } catch (Throwable t) {
            try {
                deleteDirectory(tempGeneratedTlsCertsDir);
            } catch (Exception ex) {