'elasticsearch' is not a registered wp command

Hi,

I am trying to install elasticpress. As per the instruction on the plugin page have installed

WP-CLI
and
elasticsearch server
(as per the official elasticsearch guide) and when i trying to index using the command wp elasticpress index --setup --network-wide. Which give me the error
'elasticsearch' is not a registered wp command
.

Thanks and Regards,
Alagiri