title: can't start elasticsearch service on Rpi 4 with ubuntu server 20.04 Linux version
body: <p>I have a Raspberry Pi 4 Model B with 8 RAM and i'v tried to install and configure <code>elasticsearch</code> but when i start yhe service my CPU and RAM up to 90-100% and after a few moments i get the message
  <code>&quot;Job for elasticsearch.service failed because a timeout was exceeded.&quot;</code>
  with this warnings in journelctl -xe:</p>
  <pre><code>ubuntu systemd-entrypoint[6574]: WARNING: A terminally deprecated method in java.lang.System has been called
  
  ubuntu systemd-entrypoint[6574]: WARNING: System::setSecurityManager has been called by org.elasticsearch.bootstrap.Elasticsearch (file:/usr/share/elasticsearch/lib/elasticsearch-7.15.2.jar)
  
  ubuntu systemd-entrypoint[6574]: WARNING: Please consider reporting this to the maintainers of org.elasticsearch.bootstrap.Elasticsearch
  
  ubuntu systemd-entrypoint[6574]: WARNING: System::setSecurityManager will be removed in a future release
  ubuntu systemd-entrypoint[6574]: WARNING: A terminally deprecated method in java.lang.System has been called
  
  ubuntu systemd-entrypoint[6574]: WARNING: System::setSecurityManager has been called by org.elasticsearch.bootstrap.Security (file:/usr/share/elasticsearch/lib/elasticsearch-7.15.2.jar)
  
  ubuntu systemd-entrypoint[6574]: WARNING: Please consider reporting this to the maintainers of org.elasticsearch.bootstrap.Security
  
  ubuntu systemd-entrypoint[6574]: WARNING: System::setSecurityManager will be removed in a future release
  </code></pre>
  <p>please assist</p>