Ruby on Rails

The docs at https://github.com/elastic/elasticsearch-rails just say to run `gem install elasticsearch-model elasticsearch-rails` and don't even say to put `gem elasticsearch-model` and `gem elasticsearch-rails` in my gemfile but if i don't the webrick server won't start I think the docs fail to mention that this is assuming elasticsearch is installed as a system service on yours or your host's server I have installed and removed different versions of elasticsearch as a system service on my LM18Sarah desktop but haven't been able to connect on localhost:9200 To further confuse me in package manager there's not only elasticsearch but there's also ruby-elasticsearch and ruby-elasticsearch-api and ruby-elasticsearch-transport What a mess What's the right way to install elasticsearch on my system