jan-sen

That’s not not true at all! Firstly you must set “custom fields to include in the index” to “all” (settings) and secondly you must copy this script to your functions:

add_filter('relevanssi_excerpt_content', 'excerpt_function', 10, 3);
function excerpt_function($content, $post, $query) {

global $wpdb;
$fields = $wpdb->get_col("SELECT DISTINCT(meta_key) FROM $wpdb->postmeta");

foreach($fields as $key => $field){
$field_value = get_post_meta($post->ID, $field, TRUE);
$content .= ' ' . ( is_array($field_value) ? implode(' ', $field_value) : $field_value );
}

return $content;
}