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/**
 * Force the search results page to only show Excertps
 */
add_action( 'genesis_before_loop', 'mw_show_only_excerpts_search' );
function mw_show_only_excerpts_search() {
  if ( is_search() ) {
        add_filter( 'genesis_pre_get_option_content_archive', 'mw_show_excerpts' );
    }
}
function mw_show_excerpts() {
    return 'excerpts';
}