Edit file File name : 20200430075614_AddIndexableObjectIdAndTypeIndex.php Content :<?php namespace Yoast\WP\SEO\Config\Migrations; use Yoast\WP\Lib\Migrations\Migration; use Yoast\WP\Lib\Model; /** * Class AddIndexableObjectIdAndTypeIndex. */ class AddIndexableObjectIdAndTypeIndex extends Migration { /** * The plugin this migration belongs to. * * @var string */ public static $plugin = 'free'; /** * Migration up. * * @return void */ public function up() { $this->add_index( $this->get_table_name(), [ 'object_id', 'object_type', ], [ 'name' => 'object_id_and_type', ] ); } /** * Migration down. * * @return void */ public function down() { $this->remove_index( $this->get_table_name(), [ 'object_id', 'object_type', ], [ 'name' => 'object_id_and_type', ] ); } /** * 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