elasticsearch package doesn't work in lxc

es.yaml

#cloud-config
output:
 all: "|tee -a /tmp/cloud.out"
bootcmd:
 - curl -sL https://artifacts.elastic.co/GPG-KEY-elasticsearch | apt-key add -
apt_sources:
 - source: "deb https://artifacts.elastic.co/packages/5.x/apt stable main"
packages:
 - elasticsearch
runcmd:
 - service elasticsearch start

go

lxc launch -e ubuntu:16.04 es-test -c user.user-data="$(cat es.yaml)"
lxc exec es-test tail -f /tmp/cloud.out