Drush options to index a limited number of items (and with batch-size)

Trying to index nodes with drush, I needed to limit the number of items indexed at once to cope with size and performance issues.

Following the documentation I tried the commands

drush sapi-i node_index 100
drush sapi-i node_index 100 1

but got error:

In DrushArgvInput.php line 192:

[Symfony\Component\Console\Exception\RuntimeException]
Too many arguments, expected arguments "command" "indexId".

drush version 9.7.1

Using this format is working like a charm
drush sapi-i node_index --limit=100
drush sapi-i node_index --limit=100 --batch-size=10

I don't know if this is a code or documentation issue.
I adapted the documentation as in the patch