For more installation options, see the
https://www.elastic.co/guide/en/elasticsearch/reference/current/install-elasticsearch.html[Elasticsearch installation
documentation].

[[upgrade]]
== Upgrade

To upgrade from an earlier version of Elasticsearch, see the
https://www.elastic.co/guide/en/elasticsearch/reference/current/setup-upgrade.html[Elasticsearch upgrade
documentation].

[[build-source]]
== Build from source

     */
    public static MonotonicClock get() {
        return CLOCK;
    }

    /**
     * Returns the current instant from the monotonic clock.
     * This is a convenience method equivalent to {@code get().instant()}.
     *
     * @return the current instant using monotonic timing
     */
    public static Instant now() {
        return get().instant();
    }

    /**

        /**
         * The number of milliseconds from the start of the current second.
         */
        public int msecs;
        /**
         * The current hour (0-23).
         */
        public int hours;
        /**
         * The current minute (0-59).
         */
        public int mins;
        /**
         * The current second (0-59).
         */
        public int secs;
        /**

# Currently, there is no way to pass multiple cookies with the same name.
# The only way to pass multiple values for cookie params is to serialize them using

			Name:   name,
			Labels: labels,
		}
	}

	if isCumulative {
		metric.Current = val - metric.Cumulative
		metric.Cumulative = val
	} else {
		metric.Current = val
	}

	if metric.Current > metric.Max {
		metric.Max = val
	}

	metric.Sum += metric.Current
	metric.Count++

	metric.Avg = metric.Sum / float64(metric.Count)
	subsysMetrics[key] = metric

        return Stream.concat(
            javaInstallationRegistry.listInstallations().stream(),
            Stream.of(new InstallationLocation(Jvm.current().getJavaHome(), "Current JVM"))
        );
    }

    private static String getTestSeed() {
        String testSeedProperty = System.getProperty("tests.seed");
        final String testSeed;

	// Linear search, we likely have to insert at front.
	for i, existing := range x.versions {
		if existing.header.ModTime <= modTime {
			// Insert at current idx. First move current back.
			copy(x.versions[i+1:], x.versions[i:])
			x.versions[i] = xlMetaV2ShallowVersion{
				header: ver.header(),
				meta:   encoded,
			}
			return nil
		}
	}

                runningInstallTask.get() -> "from current time because installing"
                runningDocsTestTask.get() -> "from current time because testing docs"
                runningOnCi.get() -> "from current time because CI"
                else -> "from current date"
            }
        }

    private

	// Points to current configuration directory -- deprecated, to be removed in future.
	globalConfigDir = defaultConfigDir
	// Points to current certs directory set by user with --certs-dir
	globalCertsDir = defaultCertsDir
	// Points to relative path to certs directory and is <value-of-certs-dir>/CAs
	globalCertsCADir = defaultCertsCADir
)

// Get - returns current directory.
func (dir *ConfigDir) Get() string {

    }

    return Builder(this)
      .cipherSuites(*cipherSuitesIntersection)
      .tlsVersions(*tlsVersionsIntersection)
      .build()
  }

  /**
   * Returns `true` if the socket, as currently configured, supports this connection spec. In
   * order for a socket to be compatible the enabled cipher suites and protocols must intersect.
   *