public String getNewDBInstanceIdentifier() {
        return this.newDBInstanceIdentifier;
    }
<p>
The new instance identifier for the instance when renaming an instance. When you change the instance identifier,
an instance reboot occurs immediately if you set <code>Apply Immediately</code> to <code>true</code>. It occurs
during the next maintenance window if you set <code>Apply Immediately</code> to <code>false</code>. This value is
stored as a lowercase string.
</p>
<p>
Constraints:
</p>
<ul>
<li>
<p>
Must contain from 1 to 63 letters, numbers, or hyphens.
</p>
</li>
<li>
<p>
The first character must be a letter.
</p>
</li>
<li>
<p>
Cannot end with a hyphen or contain two consecutive hyphens.
</p>
</li>
</ul>
<p>
Example: <code>mydbinstance</code>
</p>

@return The new instance identifier for the instance when renaming an instance. When you change the instance
        identifier, an instance reboot occurs immediately if you set <code>Apply Immediately</code> to
        <code>true</code>. It occurs during the next maintenance window if you set <code>Apply Immediately</code>
        to <code>false</code>. This value is stored as a lowercase string. </p>
        <p>
        Constraints:
        </p>
        <ul>
        <li>
        <p>
        Must contain from 1 to 63 letters, numbers, or hyphens.
        </p>
        </li>
        <li>
        <p>
        The first character must be a letter.
        </p>
        </li>
        <li>
        <p>
        Cannot end with a hyphen or contain two consecutive hyphens.
        </p>
        </li>
        </ul>
        <p>
        Example: <code>mydbinstance</code>
aws-java-sdk-docdb/src/main/java/com/amazonaws/services/docdb/model/ModifyDBInstanceRequest.java