Includes Product Custom Fields to WooCommerce Search Criteria
you just save my life
It is not search by Custom Field.
It is search only in Custom Fields.
Works just like that out of the box when searching for custom fields. Good job.
This is exactly what I was looking for. Just activate it & any custom fields you have created for your woocommerce products will be searchable through your theme's default search. No need to adjust any settings.