updated ES installation

README.md

@@ -82,6 +82,11 @@ The following steps were reproduced in that order on a fully updated Ubuntu 15.1
     sudo systemctl enable elasticsearch
     sudo systemctl restart elasticsearch
     ```
+    if installed from within a VM, rebind ElasticSearch host:
+    ```bash
+    sudo echo "network.bind_host: 0" >> /etc/elasticsearch/elasticsearch.yml
+    sudo systemctl restart elasticsearch
+    ```
     
     and test if it is available:
     ```bash