Query by Author Configuration

To enable Data Source Query by author (see /widget-core-reference/4.6/query_by_author.html), and to be able to search for authors by username, you need to add the following XML fragment to schema.xml:

<field name="username_text" type="string" indexed="true" stored="true"/>
<field name="author_username_s" type="string" indexed="true" stored="false" multiValued="true" />