UbuntuにElasticsearchをインストール

$ lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 20.04.2 LTS
Release:	20.04

wget -qO - https://artifacts.elastic.co/GPG-KEY-elasticsearch | sudo apt-key add -

sudo apt-get install apt-transport-https

echo "deb https://artifacts.elastic.co/packages/7.x/apt stable main" | sudo tee /etc/apt/sources.list.d/elastic-7.x.list

sudo apt-get update && sudo apt-get install elasticsearch

ps -p 1

$ ps -p 1
PID TTY          TIME CMD
 1 ?        00:10:51 systemd

sudo systemctl start elasticsearch.service

sudo systemctl stop elasticsearch.service

$ sudo lsof -i:9200
COMMAND    PID          USER   FD   TYPE  DEVICE SIZE/OFF NODE NAME
java    828030 elasticsearch  290u  IPv6 5914830      0t0  TCP ip6-localhost:9200 (LISTEN)
java    828030 elasticsearch  291u  IPv6 5914831      0t0  TCP localhost:9200 (LISTEN)