Add the property to the filteringConfiguration.xml file. See Default Filtering.

Include the expand attribute in the property element. Set the value of the attribute to false.

<rest-filtering>
<component name="/atg/commerce/catalog/ProductCatalog"
default-include="true">
<item-descriptor name="product">
<property name="creationDate"
expand="false"/>
</item-descriptor>
</component>
</rest-filtering>