ACF Gallery and Relevanssi Filter...

I tried this in functions.php first:

add_filter('relevanssi_excerpt_content', 'custom_fields_to_excerpts', 10, 3);
function custom_fields_to_excerpts($content, $post, $query) {
    $images = get_post_meta($post->ID, 'gallery', true);
	if( $images ) {
		foreach( $images as $image ) {
			$content .= " " . $image['title'];
			$content .= " " . $image['caption'];
		}
		return $content;
	}
}


Then, I tried this version (unfortunately, neither worked):

add_filter('relevanssi_excerpt_content', 'custom_fields_to_excerpts', 10, 3);
function custom_fields_to_excerpts($content, $post, $query) {
	$images = get_field('gallery', $post->ID);
	if($images){
		foreach( $images as $image ) {
			$content .= " " . $image['title'];
			$content .= " " . $image['caption'];
		}
	}
	return $content;
}