code: protected function createIndexes()
      {
      // sitemap_sitemaprecord table
          $this->createIndex(
              $this->db->getIndexName(
                  '{{%dolphiq_sitemap_entries}}',
                  ['type', 'linkId'],
                  true
              ),
              '{{%dolphiq_sitemap_entries}}',
              ['type', 'linkId'],
              true
          );
          // Additional commands depending on the db driver
          switch ($this->driver) {
              case DbConfig::DRIVER_MYSQL:
                  break;
              case DbConfig::DRIVER_PGSQL:
                  break;
          }
      }
docs: Creates the indexes needed for the Records used by the plugin
  
  @return void