After upgrading Elasticsearch 2.2.0 from 1.7.2, Other hosts can't connect to it.

After upgrading Elasticsearch 2.2.0 from 1.7.2, Other hosts can't connect to it.

In 1.7.2, it is binding to `0.0.0.0`, so you can access to it from any host:

The network.bind_host setting allows to control the host different network components will bind on. By default, the bind host will be anyLocalAddress (typically 0.0.0.0 or ::0).

But in 2.2.0, it is binding to `127.0.0.1`, so you can't access to it from other hosts:

Defaults to _local_.

To access from other hosts, you have to add the following to `config/elasticsearch.yml`:

network:
  host:
    - _en0_
    - _local_

`en0` will be your network interface.

References:
https://www.elastic.co/guide/en/elasticsearch/reference/1.7/modules-network.html
https://www.elastic.co/guide/en/elasticsearch/reference/current/modules-network.html
https://www.elastic.co/guide/en/elasticsearch/reference/current/modules-network.html#network-interface-values