Add custom post type to dedicated WordPress search results page for Algolia plugin for WordPress

algolia-custom-post-types.php

<?php

// See: https://github.com/algolia/algoliasearch-wordpress/blob/master/includes/class-algolia-plugin.php#L181

// To be added to the functions.php of your active theme for example.
add_filter( 'algolia_searchable_post_types', function( array $post_types ) {
  $post_types[] = 'my_custom_post_type';
  
  return $post_types;
} );