First setup of elasticsearch

templates/etc/systemd/system/elasticsearch.service.j2

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+[Unit]
+Description=Elasticsearch
+Documentation=https://www.elastic.co
+Wants=network-online.target
+After=network-online.target
+
+[Service]
+Type=simple
+# the elasticsearch process currently sends the notifications back to systemd
+# and for some reason exec does not work (even though it is a child). We should change
+# this notify access back to main (the default), see https://github.com/elastic/elasticsearch/issues/86475
+NotifyAccess=all
+RuntimeDirectory=elasticsearch
+PrivateTmp=true
+Environment=ES_HOME={{ elastic_home }}
+Environment=ES_PATH_CONF={{ elastic_conf }}
+Environment=PID_DIR={{ elastic_home }}
+Environment=ES_SD_NOTIFY=true
+EnvironmentFile=-@path.env@
+
+WorkingDirectory={{ elastic_home }}
+
+User={{ elastic_usr }}
+Group={{ elastic_grp }}
+
+ExecStart={{ elastic_link }}/bin/elasticsearch -p ${PID_DIR}/elasticsearch.pid --quiet
+
+# StandardOutput is configured to redirect to journalctl since
+# some error messages may be logged in standard output before
+# elasticsearch logging system is initialized. Elasticsearch
+# stores its logs in /var/log/elasticsearch and does not use
+# journalctl by default. If you also want to enable journalctl
+# logging, you can simply remove the "quiet" option from ExecStart.
+StandardOutput=journal
+StandardError=inherit
+
+# Specifies the maximum file descriptor number that can be opened by this process
+LimitNOFILE=65535
+
+# Specifies the maximum number of processes
+LimitNPROC=4096
+
+# Specifies the maximum size of virtual memory
+LimitAS=infinity
+
+# Specifies the maximum file size
+LimitFSIZE=infinity
+
+# Disable timeout logic and wait until process is stopped
+TimeoutStopSec=0
+
+# SIGTERM signal is used to stop the Java process
+KillSignal=SIGTERM
+
+# Send the signal only to the JVM rather than its control group
+KillMode=process
+
+# Java process is never killed
+SendSIGKILL=no
+
+# When a JVM receives a SIGTERM signal it exits with code 143
+SuccessExitStatus=143
+
+# Allow a slow startup before the systemd notifier module kicks in to extend the timeout
+TimeoutStartSec=900
+
+[Install]
+WantedBy=multi-user.target