Plugin update fails

Elastic Stack Logstash
1

Hello,
One of our Logstash 2.0.0 has an issue with the update command.

Error Bundler::InstallError, retrying 10/10
An error occurred while installing nokogiri (1.6.6.4), and Bundler cannot continue.
Make sure that gem install nokogiri -v '1.6.6.4' succeeds before bundling.
WARNING: SSLSocket#session= is not supported
Too many retries, aborting, caused by Bundler::InstallError
ERROR: Updated Aborted, message: An error occurred while installing nokogiri (1.6.6.4), and Bundler cannot continue.
Make sure that gem install nokogiri -v '1.6.6.4' succeeds before bundling.

So we ran gem install nokogiri -v '1.6.6.4'

Building native extensions. This could take a while...
Successfully installed nokogiri-1.6.6.4
Parsing documentation for nokogiri-1.6.6.4
Done installing documentation for nokogiri after 2 seconds
1 gem installed

We then tried again to run /opt/logstash/bin/plugin update but we keep getting the error.

Thanks in advance

2

Can't say I have ever heard of this plugin, where did you find it?