code: public boolean isSolrSearch() {
  
          if (VFS.equals(m_source)) {
              // VFS search selected
              return false;
          }
          // index selected and query entered --> Solr search else VFS
          return (CmsStringUtil.isNotEmptyOrWhitespaceOnly(m_source)
              && CmsStringUtil.isNotEmptyOrWhitespaceOnly(m_query));
      }
docs: Returns <code>true</code> if Solr index is selected and a query was entered.<p>
  
  @return <code>true</code> if Solr index is selected and a query was entered