protected function configure()
{
$this->setName('index:reindex')->addArgument('index_code', InputArgument::OPTIONAL, 'Code of indexer.')->setDescription('Reindex a magento index by code');
$help = <<<HELP
Index by indexer code. Code is optional. If you don't specify a code you can pick a indexer from a list.
\$ n98-magerun.phar index:reindex [code]
Since 1.75.0 it's possible to run mutiple indexers by seperating code with a comma.
i.e.
\$ n98-magerun.phar index:reindex catalog_product_attribute,tag_summary
If no index is provided as argument you can select indexers from menu by "number" like "1,3" for first and third
indexer.
HELP;
$this->setHelp($help);
}