docker run -d --name elasticsearch -p 9200:9200 -p 9300:9300 -e "discovery.type=single-node" -e ES_JAVA_OPTS="-Xms64m -Xmx512m" elasticsearch:7.6.2 # -e ES_JAVA_OPTS="-Xms64m -Xmx512m" 限制es大小
