我在想我为什么要拿到401。
采取的步骤：
创建了elasticsearch.keystore
添加 bootstrap.password 成功，与 cat ~/.elk.secret | /opt/elasticsearch/bin/elasticsearch-keystore add -x 'bootstrap.password' 因为我运行了多个示例，所以我将它移到新的conf目录中
但现在我得到了401：

curl -X GET 'https://elastic:myFancyPass@myServer:9200/_cluster/health?pretty' -k
{
  "error" : {
    "root_cause" : [
      {
        "type" : "security_exception",
        "reason" : "unable to authenticate user [elastic] for REST request [/_cluster/health?pretty]",
        "header" : {
          "WWW-Authenticate" : [
            "Bearer realm=\"security\"",
            "ApiKey",
            "Basic realm=\"security\" charset=\"UTF-8\""
          ]
        }
      }
    ],
    "type" : "security_exception",
    "reason" : "unable to authenticate user [elastic] for REST request [/_cluster/health?pretty]",
    "header" : {
      "WWW-Authenticate" : [
        "Bearer realm=\"security\"",
        "ApiKey",
        "Basic realm=\"security\" charset=\"UTF-8\""
      ]
    }
  },
  "status" : 401
}

我的理解是，这个错误可能是由两个原因造成的：
密码错误（我怀疑这是我的情况）
错误的elasticsearch.file
如何找到正在加载的elasticsearch.keystore？
跑步 rootLogger.level = debug 没用。我觉得得到这样的确认会很好 /opt/elasticsearch/instance2/conf/elasticsearch.keystore