public String getDocumentAttributeKey() {
        return this.documentAttributeKey;
    }
<p>
The name of the document attribute used to sort the response. You can use any field that has the
<code>Sortable</code> flag set to true.
</p>
<p>
You can also sort by any of the following built-in attributes:
</p>
<ul>
<li>
<p>
_category
</p>
</li>
<li>
<p>
_created_at
</p>
</li>
<li>
<p>
_last_updated_at
</p>
</li>
<li>
<p>
_version
</p>
</li>
<li>
<p>
_view_count
</p>
</li>
</ul>

@return The name of the document attribute used to sort the response. You can use any field that has the
        <code>Sortable</code> flag set to true.</p>
        <p>
        You can also sort by any of the following built-in attributes:
        </p>
        <ul>
        <li>
        <p>
        _category
        </p>
        </li>
        <li>
        <p>
        _created_at
        </p>
        </li>
        <li>
        <p>
        _last_updated_at
        </p>
        </li>
        <li>
        <p>
        _version
        </p>
        </li>
        <li>
        <p>
        _view_count
        </p>
        </li>
aws-java-sdk-kendra/src/main/java/com/amazonaws/services/kendra/model/SortingConfiguration.java