Edit file File name : 20200702141921_CreateIndexableSubpagesIndex.php Content :<?php namespace Yoast\WP\SEO\Config\Migrations; use Yoast\WP\Lib\Migrations\Migration; use Yoast\WP\Lib\Model; /** * CreateIndexableSubpagesIndex class. */ class CreateIndexableSubpagesIndex extends Migration { /** * The plugin this migration belongs to. * * @var string */ public static $plugin = 'free'; /** * Migration up. * * @return void */ public function up() { $this->change_column( $this->get_table_name(), 'post_status', 'string', [ 'null' => true, 'limit' => 20, ] ); $this->add_index( $this->get_table_name(), [ 'post_parent', 'object_type', 'post_status', 'object_id' ], [ 'name' => 'subpages' ] ); } /** * Migration down. * * @return void */ public function down() { $this->change_column( $this->get_table_name(), 'post_status', 'string', [ 'null' => true, 'limit' => 191, ] ); $this->remove_index( $this->get_table_name(), [ 'post_parent', 'object_type', 'post_status', 'object_id' ], [ 'name' => 'subpages' ] ); } /** * Retrieves the table name to use for storing indexables. * * @return string The table name to use. */ protected function get_table_name() { return Model::get_table_name( 'Indexable' ); } } Save