by default indexer set shedule how to magento 2 code example

Example 1: magento 2 reindex

php bin/magento indexer:reindex

Example 2: set indexer mode command line magento 2

bin/magento indexer:set-mode {realtime|schedule} [indexer]

Example 3: set indexer on sheduled magento 2

bin/magento indexer:set-mode schedule indexername