Index layouts relationship fields for SearchWP

wp-tweaks.php

// Adds additional processing for ACF field with the name my_acf_relationship_field
function my_searchwp_acf_relationship_processor( $customFieldValue, $customFieldName, $thePost ){
	$content_to_index = '';
	if ( 'partner_filter' == $customFieldName ) {
		$partner_filter = $customFieldValue[0];
	}
	preg_match( '/^layouts_\d+_post_type/i', $customFieldName, $matches );
	if( 'post_type' == $customFieldName || ( ! empty( $matches ) && is_array( $customFieldValue ) && ! empty( $customFieldValue ) ) ){
		$post_type = $customFieldValue[0];

		if( $post_type == 'post' ){
			// define the query here
			$args = array(
				'post_type' => 'post'
			);
		}else if( $post_type == 'muw_program' ){
			// define the query here
			$args = array(
				'post_type' => 'muw_program'
			);
		}else if( $post_type == 'muw_events' ){
			// define the query here
			$args = array(
				'post_type' => 'muw_events'
			);
		}else if( $post_type == 'muw_allies' ){
			// define the query here
			$args = array(
				'post_type' => 'muw_allies'
			);
		}else if( $post_type == 'muw_partners' ){
			// define the query here
			// has option to filter by taxonomy, muw_partner_types
			// otherwise, display all
			if( $partner_filter != '' ){
				$args = array(
					'post_type' => 'muw_partners',
					'tax_query' => array(
						array(
							'taxonomy' => 'muw_partner_types',
							'field'    => 'id',
							'terms'    => $partner_filter
						)
					)
				);
			}else{
				$args = array(
					'post_type' => 'muw_partners'
				);
			}
		}
		$args['no_paging'] = true;
		$query = new WP_Query( $args );
		if( $query->have_posts() ) :
			while( $query->have_posts() ) : $query->the_post();
				$listing_title = get_the_title();
				$content_to_index .= $listing_title . ' ';
			endwhile;
		endif;

		wp_reset_postdata();

		return $content_to_index;

	}

	preg_match( '/^layouts_\d+_available_content/i', $customFieldName, $matches );
	if( ! empty( $matches ) && is_array( $customFieldValue ) && ! empty( $customFieldValue ) ){
		// We want to index Titles not IDs
		foreach( $customFieldValue[0] as $post_id ){
			$post_title = get_the_title( absint( $post_id ) );
			$content_to_index .= $post_title . ' ';
		}
		return $content_to_index;
	}
	return $customFieldValue;
}
add_filter( 'searchwp_custom_fields', 'my_searchwp_acf_relationship_processor', 10, 3 );