Use WP-CLI to enter `wp shell`, enter the following class, and then run `(new SEO_Update_Command())->__invoke()` to start the process.

add-noindex-to-posts.php

if (class_exists('WP_CLI')) { class SEO_Update_Command { public function __invoke() { global $wpdb; $post_ids = $wpdb->get_col("SELECT ID FROM $wpdb->posts WHERE post_type = 'salary_market_data' AND post_parent != 0"); $progress = \WP_CLI\Utils\make_progress_bar( 'Updating...', count($post_ids)); foreach($post_ids as $post_id) { update_post_meta($post_id, "_yoast_wpseo_meta-robots-noindex", 1); $progress->tick(); } $progress->finish(); WP_CLI::success('Meta values updated successfully.'); }} WP_CLI::add_command('seo_update', 'SEO_Update_Command');}

Running update_post_meta alone does not trigger wp_update_post which may be necessary to rebuild Yoast indexables. This can be run after the initial run of SEO_Update_Command() (if it does not include wp_udpate_post already.

if (class_exists('WP_CLI')) { class SEO_Reindex_Command { public function __invoke() { global $wpdb; $post_ids = $wpdb->get_col("SELECT ID FROM $wpdb->posts WHERE post_type = 'salary_market_data' AND post_parent != 0"); $repository = YoastSEO()->classes->get (\Yoast\WP\SEO\Repositories\Indexable_Repository::class); $builder = YoastSEO()->classes->get(\Yoast\WP\SEO\Builders\Indexable_Builder::class); $progress = \WP_CLI\Utils\make_progress_bar('Reindexing...', count($post_ids)); foreach($post_ids as $post_id) { $indexable = $repository->find_by_id_and_type($post_id, 'post', false); $builder->build_for_id_and_type($post_id, 'post', $indexable); $progress->tick(); } $progress->finish(); WP_CLI::success('Indexables rebuilt.'); }} WP_CLI::add_command('seo_reindex', 'SEO_Reindex_Command'); }

(new SEO_Reindex_Command())->__invoke()