While I'd like Elasticsearch to never run out of memory - shit happens. When one of the Elasticsearch nodes fills its memory the cluster goes unstable. You get lots of these messages:
```
[2015-06-15 07:08:27,157][WARN ][transport ] [elastic1001] Received response for a request that has timed out, sent [85169ms] ago, timed out [55169ms] ago, action [/cluster/nodes/indices/shard/store/n], node [[elastic1018][dNTrd0-ET-CNTNHKk8hdHA][elastic1018][inet[/10.64.48.40:9300]]{rack=D3, row=D, master=false}], id [2666516874]
[2015-06-15 07:08:27,169][WARN ][transport ] [elastic1001] Received response for a request that has timed out, sent [186476ms] ago, timed out [156476ms] ago, action [discovery/zen/fd/ping], node [[elastic1018][dNTrd0-ET-CNTNHKk8hdHA][elastic1018][inet[/10.64.48.40:9300]]{rack=D3, row=D, master=false}], id [2666499840]
[2015-06-15 07:08:27,169][WARN ][transport ] [elastic1001] Received response for a request that has timed out, sent [156476ms] ago, timed out [126475ms] ago, action [discovery/zen/fd/ping], node [[elastic1018][dNTrd0-ET-CNTNHKk8hdHA][elastic1018][inet[/10.64.48.40:9300]]{rack=D3, row=D, master=false}], id [2666507408]
[2015-06-15 07:08:27,169][WARN ][transport ] [elastic1001] Received response for a request that has timed out, sent [126475ms] ago, timed out [96475ms] ago, action [discovery/zen/fd/ping], node [[elastic1018][dNTrd0-ET-CNTNHKk8hdHA][elastic1018][inet[/10.64.48.40:9300]]{rack=D3, row=D, master=false}], id [2666508860]
[2015-06-15 07:08:27,176][WARN ][transport ] [elastic1001] Received response for a request that has timed out, sent [175193ms] ago, timed out [145193ms] ago, action [/cluster/nodes/indices/shard/store/n], node [[elastic1018][dNTrd0-ET-CNTNHKk8hdHA][elastic1018][inet[/10.64.48.40:9300]]{rack=D3, row=D, master=false}], id [2666500327]
[2015-06-15 07:08:27,177][WARN ][transport ] [elastic1001] Received response for a request that has timed out, sent [115191ms] ago, timed out [85191ms] ago, action [/cluster/nodes/indices/shard/store/n], node [[elastic1018][dNTrd0-ET-CNTNHKk8hdHA][elastic1018][inet[/10.64.48.40:9300]]{rack=D3, row=D, master=false}], id [2666509258]
[2015-06-15 07:08:27,187][WARN ][transport ] [elastic1001] Received response for a request that has timed out, sent [55198ms] ago, timed out [25198ms] ago, action [/cluster/nodes/indices/shard/store/n], node [[elastic1018][dNTrd0-ET-CNTNHKk8hdHA][elastic1018][inet[/10.64.48.40:9300]]{rack=D3, row=D, master=false}], id [2666518331]
```