Index filenames for all images in galleries on the current page in SearchWP

gistfile1.php

<?php
 
function my_searchwp_extra_metadata( $extra_meta, $post_being_indexed ) {
    // make sure there's a shortcode
 	if( has_shortcode( $post_being_indexed->post_content, 'gallery' ) ) {
        $galleries = get_post_galleries_images( $post_being_indexed );
        if( !empty( $galleries ) ) {
            $all_gallery_images = array();
            foreach( $galleries as $gallery ) {
                foreach( $gallery as $image ) {
                    $all_gallery_images[] = $image;
                }
            }
            $extra_meta['my_images'] = $all_gallery_images;
        }
 	}
 	
    return $extra_meta;
}
 
add_filter( 'searchwp_extra_metadata', 'my_searchwp_extra_metadata', 10, 2 );

function my_searchwp_meta_keys( $keys ) {
    // the keys we used to store author meta (see https://gist.github.com/jchristopher/8558947 for more info)
    $my_custom_meta_keys = array( 
        'my_images' 
    );
    
    // merge my custom meta keys with the existing keys
    $keys = array_merge( $keys, $my_custom_meta_keys );
    
    // make sure there aren't any duplicates
    $keys = array_unique( $keys );
    
    return $keys;
}
 
add_filter( 'searchwp_custom_field_keys', 'my_searchwp_meta_keys', 10, 1 );