Logstash plugin is successfully installed but not found

Hi folks,

I am using logstash 2.3.2 and for one of my project I have to save some data in RAM. I asked a question on stackoverflow (Logstash: is it possible to save documents in memory?) to get a filter for that and the most appropriate filter is memcached (even if this one is unofficial).

I downloaded the plugin, I generated the gem file (which is not empty) and I successfully installed the plugin.

However, when i run logsatsh by using this filter in my configuration file, I get the following error:

:reason=>"Couldn't find any filter plugin named 'memcached'. Are you sure this is correct? Trying to load the memcached filter plugin resulted in this error: no such file to load -- logstash/filters/memcached", :level=>:error}

Moreover, when i use the command bin/logstah-plugin list,the filter memcached is not present.

I don't understand why it is happening. I followed this discussion ( Logstash plugin installed but not found ) but without success !

So, do you know how I can solve this problem ?

Thank you for your attention and your help.