ACF: Indexing files from File fields

Good morning,

Relevanssi can index attachment contents from files linked to posts with ACF File fields. This does not happen automatically but requires some extra code.

add_filter( 'relevanssi_content_to_index', 'rlv_get_acf_file', 10, 2 );
add_filter( 'relevanssi_excerpt_content', 'rlv_get_acf_file', 10, 2 );

function rlv_get_acf_file( $content, $_post ) {
    $file = get_field( 'pdf_file', $_post->ID );
    if ( is_array( $file ) && isset( $file['ID'] ) ) {
        $content .= ' ' . get_post_meta( $file['ID'], '_relevanssi_pdf_content', true );
    }
    return $content;
}

I added the code to your site and rebuilt the index. But I get no results when searching for a pdf file of a post.

Can you help me?
Thank you so much