public String getUpgradeStep() {
        return this.upgradeStep;
    }
<p>
Represents one of 3 steps that an Upgrade or Upgrade Eligibility Check does through:
<ul>
<li>PreUpgradeCheck</li>
<li>Snapshot</li>
<li>Upgrade</li>
</ul>
</p>

@return Represents one of 3 steps that an Upgrade or Upgrade Eligibility Check does through:
        <ul>
        <li>PreUpgradeCheck</li>
        <li>Snapshot</li>
        <li>Upgrade</li>
        </ul>
@see UpgradeStep
aws-java-sdk-elasticsearch/src/main/java/com/amazonaws/services/elasticsearch/model/GetUpgradeStatusResult.java