title: Wordpress, search in excerpt instead content
body: <p>im new posting in the forum, but here i found answers without ask, just searching, thanks about that. </p>
  
  <p>Here go my questions: </p>
  
  <p>I have a custom post type called 'publicacion' and there the next custom WP_Query: </p>
  
  <pre><code>$query_args = array( 
          's' =&gt; mysql_real_escape_string( $_GET['s'] ),
          'post_type' =&gt; 'publicacion',
          'meta_key' =&gt; 'meta-box-fp'
      );
  
      if( $_GET['autor'] != '' ) {
          $query_args['tax_query'] = array( 
                                          array( 
                                              'taxonomy' =&gt; 'autores', 
                                              'field' =&gt; 'slug', 
                                              'terms' =&gt; mysql_real_escape_string( $_GET['autor'] ) 
                                          ) 
                                      );
      }
  
      if( trim( $_GET['fini'] ) != '' || trim( $_GET['ffin'] ) != '' ) {
          $query_args['meta_query'] = array ( 
                                          array( 
                                              'key' =&gt; 'meta-box-fp',
                                              'value' =&gt; array( mysql_real_escape_string( $_GET['fini'] ) . '-00-00', mysql_real_escape_string( $_GET['ffin'] ) . '-00-00' ), 
                                              'type' =&gt; 'DATE',
                                              'compare' =&gt; 'BETWEEN' ) 
                                      );
      }
  
      if( isset( $_GET['ord_by'] ) ) {
          $ordby = mysql_real_escape_string( $_GET['ord_by'] ) == 'year' ? 'meta_value' : mysql_real_escape_string( $_GET['ord_by'] );
          $query_args['orderby'] = $ordby;//mysql_escape_string( $_GET['ord_by'] );
          $query_args['order'] = 'DESC';//mysql_escape_string( $_GET['ord'] );
      }
  
      $query = new WP_Query( $query_args );
  </code></pre>
  
  <p>The 's' parameter redirects to the search page, but i need do the search in the archive-publicacion.php file, and i need the 's' parameter, search for excerpt instead content. 
  It is possible to do that? Thanks and i hope be clear in my question and excuse me my english. </p>