ubuntu 설치 https://www.elastic.co/guide/en/elasticsearch/reference/current/deb.html1. pgp 키 가져오기 (Pretty Good Privacy)wget -qO - https://artifacts.elastic.co/GPG-KEY-elasticsearch | sudo gpg --dearmor -o /usr/share/keyrings/elasticsearch-keyring.gpg2. 저장소 정보 업데이트.sudo apt-get install apt-transport-httpsecho "deb [signed-by=/usr/share/keyrings/elasticsearch-keyring.gpg] https://artifacts.elastic.c..