Magento 2.2.0 i have set index option update on scheduel. after i ran indexing command but it did not take effect.update on save working fine.
Maybe your crontab is not setup right.
If you have SSH access could you go to the root folder of your Magento installation and execute the following command:
If it is empty install the Magento cron by running the following command:
php bin/magento cron:install
Now if you do a crontab -l again you will see a cronscript generated by Magento and the indexes should be updated every minute now !