Your posts are not formatted using </>.
That may explain the limit.
I don't understand what is happening. You set network host: _ec2_ but got:
[2016-07-11 09:57:33,797][INFO ][transport ] [dev-lambda-elastic-1] publish_address {127.0.0.1:9300}, bound_addresses {[::1]:9300}, {127.0.0.1:9300}
It does not make sense. Are you sure that your configuration is applied?
What happens if you set:
network host: 192.168.0.1
It should fail.