ElasticSearch doesn't start after installing 5.6.4

Hello,

I just installed ElasticSearch 5.6.4 from https://www.elastic.co/downloads/elasticsearch via DEB (I use Debian 9) package using these commands:

wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-5.6.4.deb
dpkg -i elasticsearch-5.6.4.deb
apt-get install openjdk-8-jre-headless
update-rc.d elasticsearch defaults 95 10
service elasticsearch start

But ElasticSearch won't start, this is log:

● elasticsearch.service - Elasticsearch
Loaded: loaded (/usr/lib/systemd/system/elasticsearch.service; disabled; vendor preset: enabled)
Active: failed (Result: exit-code) since Mon 2017-11-13 16:59:24 UTC; 13min ago
Docs: http://www.elastic.co
Process: 16503 ExecStart=/usr/share/elasticsearch/bin/elasticsearch -p ${PID_DIR}/elasticsearch.pid --quiet -Edefault.path.logs=${LOG_DIR} -Edefault.path.data=${DATA_DIR} -Edefault.path.conf=${CONF_DIR} (code=exited, statu
Process: 16500 ExecStartPre=/usr/share/elasticsearch/bin/elasticsearch-systemd-pre-exec (code=exited, status=0/SUCCESS)
Main PID: 16503 (code=exited, status=1/FAILURE)

Nov 13 16:59:12 Mysite systemd[1]: Starting Elasticsearch...
Nov 13 16:59:12 Mysite systemd[1]: Started Elasticsearch.
Nov 13 16:59:24 Mysite systemd[1]: elasticsearch.service: Main process exited, code=exited, status=1/FAILURE
Nov 13 16:59:24 Mysite systemd[1]: elasticsearch.service: Unit entered failed state.
Nov 13 16:59:24 Mysite systemd[1]: elasticsearch.service: Failed with result 'exit-code'.

But it doesn't say anything useful.

In config file I just changed this:

network.host: 51.15.212.76
http.port: 9200
cluster.name: elasticsearch
node.name: "db-master"
node.master: true
node.data: true

Where can be a problem?

It is now fixed, because I couldn't bind a address.

Having an internet exposed service of any kind is dangerous. You may want to fix that.

It is for development server.

Why does that make it any less important?

No, but there have access only some people and it is going to be locked by HTTP Auth.

Developers need to have a access to elastic.

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