Elasticsearch discovery Fleet service

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[Unit]
Description=ElasticSearch discovery service
BindsTo=elasticsearch@%i.service

[Service]
EnvironmentFile=/etc/environment

ExecStart=/bin/bash -c '\
  while true; do \
    curl -f ${COREOS_PRIVATE_IPV4}:9200; \
    if [ "$?" = "0" ]; then \
      etcdctl set /services/logging/es/${COREOS_PRIVATE_IPV4} \'{"http_port": 9200, "transport_port": 9300}\' --ttl 60; \
    else \
      etcdctl rm /services/logging/es/${COREOS_PRIVATE_IPV4}; \
    fi; \
    sleep 45; \
  done'

ExecStop=/usr/bin/etcdctl rm /services/logging/es/${COREOS_PRIVATE_IPV4}

[X-Fleet]
MachineOf=elasticsearch@%i.service