@Override
    public String toString() {
        return this.value;
    }
<p>
Specifies the unit of a maintenance schedule duration. Valid value is HOUR. See the <a
href="https://docs.aws.amazon.com/elasticsearch-service/latest/developerguide/auto-tune.html"
target="_blank">Developer Guide</a> for more information.
</p>
aws-java-sdk-elasticsearch/src/main/java/com/amazonaws/services/elasticsearch/model/TimeUnit.java