Logstash Error with ES-Shield plugin

I'm trying to get logstash configured to work with Elasticsearch-shield and I am running into the following error:

After running

bin/plugin install logstash-output-elasticsearch-shield

I get this error:

ERROR: Installation Aborted, message: Bundler could not find compatible versions for gem "logstash-output-elasticsearch":
In snapshot (Gemfile.lock):
logstash-output-elasticsearch (= 2.1.2)

In Gemfile:
logstash-output-elasticsearch-shield (>= 0) java depends on
logstash-output-elasticsearch (<= 0.1.9) java

logstash-output-elasticsearch (>= 0) java

Running bundle update will rebuild your snapshot from scratch, using only
the gems in your Gemfile, which may resolve the conflict.