public void setVersionNumber(Long versionNumber) {
        this.versionNumber = versionNumber;
    }
<p>
The version number for the version to describe. If a <code>VersionNumber</code> parameter value isn't provided,
the latest version of the theme is described.
</p>

@param versionNumber
       The version number for the version to describe. If a <code>VersionNumber</code> parameter value isn't
       provided, the latest version of the theme is described.
aws-java-sdk-quicksight/src/main/java/com/amazonaws/services/quicksight/model/DescribeThemeRequest.java