title: Elasticsearch cluster on Azure using ubuntu. The nodes don't see each other
body: <p>I have been setting up a cluster of Elasticsearch in Azure, using Ubuntu VM, following the tutorial on the plugin page (elasticsearch-cloud-azure) on github. I've managed to configure everything and I have elasticsearch running, but I have 3 clusters of 1 Node instead of 1 Cluster of 3 nodes. I guess that the problem comes from: </p>
  
  <p><code>cloud:
      azure:
          keystore: /path/to/keystore
          password: your_password_for_keystore
          subscription_id: your_azure_subscription_id
          service_name: your_azure_cloud_service_name
  discovery:
          type: azure
  </code></p>
  
  <p>I'm not sure of what "your_azure_cloud_service_name" should be. I have all my nodes inside a Virtual Network, so they can communicate each other. By default, on azure each time I create a VM, a new Cloud Service containing only that VM is created. Should that value be different for each of the nodes in my cluster?</p>
  
  <p>I'm a bit lost on that one...</p>