seacrh filter posts only
// Search filter returning posts only, not pages
function sd_limit_search_results_post_type( $query ) {
if ( $query->is_search ) {
$query->set( 'post_type', 'post' );
}
return $query;
}
add_filter( 'pre_get_posts', 'sd_limit_search_results_post_type' );