public void setDocumentAttributeKey(String documentAttributeKey) {
        this.documentAttributeKey = 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>

@param documentAttributeKey
       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