public void setEngineVersion(String engineVersion) {
        this.engineVersion = engineVersion;
    }
<p>
The version number of the database engine to which you want to upgrade. Changing this parameter results in an
outage. The change is applied during the next maintenance window unless the <code>ApplyImmediately</code>
parameter is set to true.
</p>
<p>
For a list of valid engine versions, see <a
href="https://docs.aws.amazon.com/neptune/latest/userguide/engine-releases.html">Engine Releases for Amazon
Neptune</a>, or call <a>DescribeDBEngineVersions</a>.
</p>

@param engineVersion
       The version number of the database engine to which you want to upgrade. Changing this parameter results in
       an outage. The change is applied during the next maintenance window unless the
       <code>ApplyImmediately</code> parameter is set to true.</p>
       <p>
       For a list of valid engine versions, see <a
       href="https://docs.aws.amazon.com/neptune/latest/userguide/engine-releases.html">Engine Releases for
       Amazon Neptune</a>, or call <a>DescribeDBEngineVersions</a>.
aws-java-sdk-neptune/src/main/java/com/amazonaws/services/neptune/model/ModifyDBClusterRequest.java