elasticsearch8只支持jdk17,17以下的版本不支持，
    各个版本参考信息：https://www.elastic.co/cn/support/matrix#matrix_jvm
    本地打开
    浏览器打开localhost:9200 

    1. {
    2.   "name": "QINBAO-PC",
    3.   "cluster_name": "elasticsearch",
    4.   "cluster_uuid": "bLYV5LfcQ_OVAi_y21LGCA",
    5.   "version": {
    6.     "number": "7.9.3",
    7.     "build_flavor": "default",
    8.     "build_type": "zip",
    9.     "build_hash": "c4138e51121ef06a6404866cddc601906fe5c868",
    10.     "build_date": "2020-10-16T10:36:16.141335Z",
    11.     "build_snapshot": false,
    12.     "lucene_version": "8.6.2",
    13.     "minimum_wire_compatibility_version": "6.8.0",
    14.     "minimum_index_compatibility_version": "6.0.0-beta1"
    15.   },
    16.   "tagline": "You Know, for Search"
    17. }