public String getUpgradeStatus() {
        return this.upgradeStatus;
    }
<p>
The current status of the upgrade. The status can take one of the following values:
</p>
<ul>
<li>
<p>
In Progress
</p>
</li>
<li>
<p>
Succeeded
</p>
</li>
<li>
<p>
Succeeded with Issues
</p>
</li>
<li>
<p>
Failed
</p>
</li>
</ul>

@return The current status of the upgrade. The status can take one of the following values: </p>
        <ul>
        <li>
        <p>
        In Progress
        </p>
        </li>
        <li>
        <p>
        Succeeded
        </p>
        </li>
        <li>
        <p>
        Succeeded with Issues
        </p>
        </li>
        <li>
        <p>
        Failed
        </p>
        </li>
@see UpgradeStatus
aws-java-sdk-opensearch/src/main/java/com/amazonaws/services/opensearch/model/UpgradeHistory.java