The getTerms() functionality previously used by the EmbeddedSolrServer has now been re-implemented for HttpSolrServer with the new custom Greenstone Solr RequestHandler class Greenstone3SearchHandler, which lives on the solr server side, in tomcat's solr webapp. The functionality has been improvemed, such as being able to search for: econom* cat, by recursively calling setRewriteMethods on any PrefixQuery and WildcardQuery MultiQueries within an overall BooleanQuery, and by handling BooleanQuery.TooManyClauses exceptions when the number of expanded terms is too large, such as for a search of a*.
