Urgent

Hello,
How i can use advanced custom fields values in relevanssi search. I am using following code but it’s not working.
add_filter(‘relevanssi_excerpt_content’, ‘excerpt_function’, 10, 3);

function excerpt_function($content, $post, $query){
	    $relevanssi_index_post_types = relevanssi_get_custom_fields();
	    if(!empty($relevanssi_index_post_types)){
	        $meta_values = '';
	        foreach($relevanssi_index_post_types AS $custom_post_type){
	            $meta_value = get_post_meta( $post->ID, $custom_post_type, true);
	            if(!empty($meta_value)){
	                $meta_values .= $meta_value.' ';
	            }
	        }
	    }

	    if(!empty($meta_values)){
	        $content .= preg_replace("/\n\r|\r\n|\n|\r/", " ", $meta_values);
	    }

	    return $content;
	}

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Thanks.

https://wordpress.org/plugins/relevanssi/