The master-is-stable indicator will retrieve useful information
regarding the discovery. This will be useful even if the local
cluster state is not recovered.

We currently do not evaluate the instance-has-master indicator
if the cluster state is not recovered, but we should remove this
constraint once master-is-stable is merged
server/src/main/java/org/elasticsearch/node/Node.java
public static final Setting<Boolean> WRITE_PORTS_FILE_SETTING = Setting.boolSetting("node.portsfile", false, Property.NodeScope);
    public static final Setting<String> NODE_NAME_SETTING = Setting.simpleString("node.name", Property.NodeScope);
    public static final Setting<String> NODE_EXTERNAL_ID_SETTING = Setting.simpleString(
        "node.external_id",
        NODE_NAME_SETTING,
        Property.NodeScope
    );
    public static final Setting.AffixSetting<String> NODE_ATTRIBUTES = Setting.prefixKeySetting(
        "node.attr.",
        (key) -> new Setting<>(key, "", (value) -> {
            if (value.length() > 0
                && (Character.isWhitespace(value.charAt(0)) || Character.isWhitespace(value.charAt(value.length() - 1)))) {
                throw new IllegalArgumentException(key + " cannot have leading or trailing whitespace " + "[" + value + "]");
            }
            if (value.length() > 0 && "node.attr.server_name".equals(key)) {
                try {
                    new SNIHostName(value);
                } catch (IllegalArgumentException e) {
                    throw new IllegalArgumentException("invalid node.attr.server_name [" + value + "]", e);