title: Elastic search not running on ubuntu 18.04
body: <pre><code>*I have installed the elasticsearch on my ubuntu 18.04 but when I start the service it is failing when I execute systemctl start elasticsearch
  saying
  elasticsearch.service - Elasticsearch
     Loaded: loaded (/usr/lib/systemd/system/elasticsearch.service; enabled; vendor preset: enabled)
     
  Active: failed (Result: exit-code) since Thu 2020-07-09 20:51:13 PKT; 4s ago
       Docs: http://www.elastic.co
    Process: 11651 ExecStart=/usr/share/elasticsearch/bin/elasticsearch -p ${PID_DIR}/elasticsearch.pid --quiet (code=exited, status=1/FAILURE)
   Main PID: 11651 (code=exited, status=1/FAILURE)
  Jul 09 20:51:05 ubuntu systemd[1]: Starting Elasticsearch...
  Jul 09 20:51:05 ubuntu elasticsearch[11651]: OpenJDK 64-Bit Server VM warning: Option UseConcMarkSweepGC was deprecated in version 9.0 and will
  Jul 09 20:51:13 ubuntu systemd[1]: elasticsearch.service: Main process exited, code=exited, status=1/FAILURE
  Jul 09 20:51:13 ubuntu systemd[1]: elasticsearch.service: Failed with result 'exit-code'.
  Jul 09 20:51:13 ubuntu systemd[1]: Failed to start Elasticsearch.
  </code></pre>
  <p>/******************************************************************************************
  */</p>
  <p>my elasticsearch.yml includes the following</p>
  <pre><code># ---------------------------------- Network -----------------------------------
  #
  # Set the bind address to a specific IP (IPv4 or IPv6):
  #
  network.host: 127.0.0.1
  #
  # Set a custom port for HTTP:
  #
  http.port: 9200
  #
  # For more information, consult the network module documentation.
  #
  # --------------------------------- Discovery ----------------------------------
  #
  # Pass an initial list of hosts to perform discovery when this node is started:
  # The default list of hosts is [&quot;127.0.0.1&quot;, &quot;[::1]&quot;]
  #
  # discovery.seed_hosts: [&quot;host-1&quot;]
  #
  # Bootstrap the cluster using an initial set of master-eligible nodes:
  #
  node.name: node-1
  cluster.initial_master_nodes: [&quot;node-1&quot;]
  #
  # For more information, consult the discovery and cluster formation module documentation.
  </code></pre>
  <p>If anyone could help me out with this. I have the openjdk version &quot;11.0.7&quot; on my PC.</p>