Logstash Hangs when installing amazon_es plugin on Windows

We have downloaded logstash-output-amazon_es for Windows from GitHub. We have ran a gem build on the downloaded gemspec file to create a gem file. We are then try to install the plugin from the gem file via: ".\bin\logstash-plugin install logstash-output-amazon_es-7.0.java.gem"; however the install hangs.