SubcontentField registration patch

zContentSearch.config

<configuration xmlns:patch="http://www.sitecore.net/xmlconfig/">
	<sitecore>
		<contentSearch>
			<indexConfigurations>
				<defaultLuceneIndexConfiguration>
					<fields hint="raw:AddComputedIndexField">
						<!-- indexes subcontent contents into parent's _content field in the index (for better site search) -->
						<field fieldName="_content" type="Foo.ContentSearch.ComputedFields.SubcontentField, Foo" />
					</fields>
				</defaultLuceneIndexConfiguration>
			</indexConfigurations>
		</contentSearch>
	</sitecore>
</configuration>