why elasticsearch start docker code example

Example 1: run elasticsearch docker

docker run --rm -p 9200:9200 -p 9300:9300 -e "discovery.type=single-node" --name elasticsearch docker.elastic.co/elasticsearch/elasticsearch:7.11.1

Example 2: run elasticsearch docker

docker run -p 9200:9200 -p 9300:9300 -e "discovery.type=single-node" docker.elastic.co/elasticsearch/elasticsearch:7.9.1