Tell SearchWP to index Titles from chosen ACF Relationship field (instead of indexing the stored post IDs)

functions.php

<?php

function my_searchwp_acf_relationship_processor( $existing_value, $the_post ) {

	if ( ! is_array( $existing_value ) ) {
		return $existing_value;
	}

	// We want to index Titles not IDs
	$content_to_index = '';

	// Iterate over stored ACF Relationship field and retrieve Title for each item
	foreach ( $existing_value as $related_post_data ) {
		if ( is_numeric( $related_post_data ) ) {
			$post_title = get_the_title( absint( $related_post_data ) );
			$content_to_index .= $post_title . ' ';
		} else {
			$related_post_data = maybe_unserialize( $related_post_data );
			if ( is_array( $related_post_data ) && ! empty( $related_post_data ) ) {
				foreach ( $related_post_data as $related_post_id ) {
					$post_title = get_the_title( absint( $related_post_id ) );
					$content_to_index .= $post_title . ' ';
				}
			}
		}
	}

	// Instead of indexing the original ACF field value (likely array of IDs)
	// we will instead be indexing a string of Titles for each chosen post
	return $content_to_index;
}

// Adds additional processing for ACF field with the name my_acf_relationship_field
add_filter( 'searchwp_custom_field_my_acf_relationship_field', 'my_searchwp_acf_relationship_processor', 10, 2 );

Hi Jonathan,
I am confused why the second foreach loop (l. 20-23) is needed, since there is none if post ids are saved. It doesn't seem to work for me that way, but maybe that is just my situation?
Cheers
Alex