Node.js AWS elasticsearch服务：Curl http命令工作正常，但不是elasticsearch npm

我正在ec2实例上运行的当前Node.js项目中配置AWS Elasticsearch服务。AWS elasticsearch域和ec2实例位于同一VPC中。我已将Elasticsearch npm配置为与AWS Elasticsearch服务连接。下面是配置

const elasticsearch = require('elasticsearch');
const awsHttpClient = require('http-aws-es')

let esConn = new elasticsearch.Client({

        host: 'https:****.amazonaws.com',
        auth: 'user:password',
        protocol: 'https',
        port: 443,
        log: 'debug',
        connectionClass: awsHttpClient,
        apiVersion: '7.x',
});


module.exports={
      "esConn" : esConn
};

但我的错误率越来越低

2021-05-20 14:26 +00:00: StatusCodeError: Authorization Exception
2021-05-20 14:26 +00:00:     at respond (/home/ec2-user/elasticsearch/node_modules/elasticsearch/src/lib/transport.js:349:15)
2021-05-20 14:26 +00:00:     at checkRespForFailure (/home/ec2-user/elasticsearch/node_modules/elasticsearch/src/lib/transport.js:306:7)
2021-05-20 14:26 +00:00:     at done (/home/ec2-user/elasticsearch/node_modules/http-aws-es/connector.js:48:7)
2021-05-20 14:26 +00:00:     at IncomingMessage.cleanUp (/home/ec2-user/elasticsearch/node_modules/http-aws-es/src/node.js:20:7)
2021-05-20 14:26 +00:00:     at IncomingMessage.emit (events.js:327:22)
2021-05-20 14:26 +00:00:     at IncomingMessage.EventEmitter.emit (domain.js:482:12)
2021-05-20 14:26 +00:00:     at endReadableNT (_stream_readable.js:1221:12)
2021-05-20 14:26 +00:00:     at processTicksAndRejections (internal/process/task_queues.js:84:21) {
2021-05-20 14:26 +00:00:   status: 403,
2021-05-20 14:26 +00:00:   displayName: 'AuthorizationException',
2021-05-20 14:26 +00:00:   path: '/',
2021-05-20 14:26 +00:00:   query: {},
2021-05-20 14:26 +00:00:   body: undefined,
2021-05-20 14:26 +00:00:   statusCode: 403,
2021-05-20 14:26 +00:00:   response: '',
2021-05-20 14:26 +00:00:   toString: [Function],
2021-05-20 14:26 +00:00:   toJSON: [Function]
2021-05-20 14:26 +00:00: }

而当我尝试curl命令时，我就能得到结果。我也尝试过下面的配置，但不起作用

let esConn = new elasticsearch.Client({
    
            host: 'https:****.amazonaws.com',
            connectionClass: awsHttpClient
    });

谢谢