Http_poller install

In order to install and use the http_poller plugin on there anything else I need to do other than the following?

bin/plugin install logstash-input-http_poller

Because after I install it and try to see whether the plugin installed properly using the following command:
./logstash -f http_poller.conf

I get the following error:

Error: No config files found: /opt/Oracle/relk/logstash/bin/http_poller.conf
Can you make sure this path is a logstash config file?
You may be interested in the '--configtest' flag which you can
use to validate logstash's configuration before you choose
to restart a running system.

That has nothing to do with the plugin, it's saying it cannot find the config file you are referring to.

Oh Ok. Thank you!