public String getScheduleAt() {
        return this.scheduleAt;
    }
<p>
When to start the service software update.
</p>
<ul>
<li>
<p>
<code>NOW</code> - Immediately schedules the update to happen in the current hour if there's capacity available.
</p>
</li>
<li>
<p>
<code>TIMESTAMP</code> - Lets you specify a custom date and time to apply the update. If you specify this value,
you must also provide a value for <code>DesiredStartTime</code>.
</p>
</li>
<li>
<p>
<code>OFF_PEAK_WINDOW</code> - Marks the update to be picked up during an upcoming off-peak window. There's no
guarantee that the update will happen during the next immediate window. Depending on capacity, it might happen in
subsequent days.
</p>
</li>
</ul>
<p>
Default: <code>NOW</code> if you don't specify a value for <code>DesiredStartTime</code>, and
<code>TIMESTAMP</code> if you do.
</p>

@return When to start the service software update.</p>
        <ul>
        <li>
        <p>
        <code>NOW</code> - Immediately schedules the update to happen in the current hour if there's capacity
        available.
        </p>
        </li>
        <li>
        <p>
        <code>TIMESTAMP</code> - Lets you specify a custom date and time to apply the update. If you specify this
        value, you must also provide a value for <code>DesiredStartTime</code>.
        </p>
        </li>
        <li>
        <p>
        <code>OFF_PEAK_WINDOW</code> - Marks the update to be picked up during an upcoming off-peak window.
        There's no guarantee that the update will happen during the next immediate window. Depending on capacity,
        it might happen in subsequent days.
        </p>
        </li>
        </ul>
        <p>
        Default: <code>NOW</code> if you don't specify a value for <code>DesiredStartTime</code>, and
        <code>TIMESTAMP</code> if you do.
@see ScheduleAt
aws-java-sdk-opensearch/src/main/java/com/amazonaws/services/opensearch/model/StartServiceSoftwareUpdateRequest.java