Sort filtered search results by revision id (newest submissions first)

[BetsyMcPhail]

This requires a change in schema.xml.

Insert new line:

<field name="text-journal.revision_id" type="string" indexed="true" stored="false" multiValued="false"/>

e.g.

<field name="id" type="string" indexed="true" stored="false" required="true"/>
<field name="key" type="string" indexed="false" stored="true" required="true"/>
<field name="name" type="text_en" indexed="true" stored="false"/>
<field name="description" type="text_en" indexed="true" stored="false"/>
<field name="metadata" type="text_en" indexed="true" stored="false"/>
<field name="ngram_search" type="text_ser" indexed="true" stored="false" multiValued="true"/>
<field name="text-journal.categories" type="text_en" indexed="true" stored="false"/>
<field name="text-journal.disclaimer" type="string" indexed="true" stored="false"/>
<field name="text-journal.revision_id" type="string" indexed="true" stored="false"  multiValued="false"/><copyField source="name" dest='ngram_search' />
<copyField source="description" dest='ngram_search' />