Code-Snippets-Functions/Execute a function on a child site/Relevanssi/indexing-product-variation-skus-main-product.txt

add_filter( 'relevanssi_content_to_index', 'rlv_index_variation_skus', 10, 2 );
function rlv_index_variation_skus( $content, $post ) {
	if ( 'product' === $post->post_type ) {
		$args       = array(
            'post_parent'    => $post->ID,
			'post_type'      => 'product_variation',
			'posts_per_page' => -1
        );
		$variations = get_posts( $args );
		if ( ! empty( $variations ) ) {
			foreach ( $variations as $variation ) {
				$sku      = get_post_meta( $variation->ID, '_sku', true );
				$content .= " $sku";
			}
		}
	}
	return $content;
}