elasticsearch已经启动的情况下

使用curl -XGET localhost:9200命令查看：

curl -XGET localhost:9200
{
  "name" : "elasticsearch",
  "cluster_name" : "docker-cluster",
  "cluster_uuid" : "92vv8XMgR-mgSwtVBVKRVA",
  "version" : {
    "number" : "7.9.3",
    "build_flavor" : "default",
    "build_type" : "docker",
    "build_hash" : "c4138e51121ef06a6404866cddc601906fe5c868",
    "build_date" : "2020-10-16T10:36:16.141335Z",
    "build_snapshot" : false,
    "lucene_version" : "8.6.2",
    "minimum_wire_compatibility_version" : "6.8.0",
    "minimum_index_compatibility_version" : "6.0.0-beta1"
  },
  "tagline" : "You Know, for Search"
}
在输出的json中有版本信息version中的number-7.9.3即为其版本号

IK 分词器下载地址

https://github.com/medcl/elasticsearch-analysis-ik/releases