The problem appears to be in
AmazonConnection.js line 17: req.headers.host = req.hostname

It appears to work if changed to: req.headers.Host = req.hostname

Encountered same issue.

    "name": "ResponseError",
    "meta": {
        "body": {
            "message": "The request signature we calculated does not match the signature you provided. Check your AWS Secret Access Key and signing method. Consult the service documentation for details."
        },
        "statusCode": 403,
        "headers": {
            "date": "Tue, 07 Jul 2020 18:55:13 GMT",
            "content-type": "application/json",
            "content-length": "192",
            "connection": "keep-alive",
            "x-amzn-requestid": "a6581234-36d9-4a57-b81d-ea2db63f0350",
            "access-control-allow-origin": "*"
        },

@nkeating-mutualofenumclaw @elastic/elasticsearch changed how headers work internally in v7.7.1. Which version are you using? Does v9 work if you upgrade to the latest version of @elastic/elasticsearch?

Also FYI this dependency is noted in package.json:

"peerDependencies": {
    "@elastic/elasticsearch": ">=7.8.0",
    "aws-sdk": "^2.709.0"
}

So you should get a warning from NPM if you're running @elastic/elasticsearch < 7.8.

I am getting the same error. We are running

  "dependencies": {
    "@elastic/elasticsearch": "^6.8.7",
    "aws-elasticsearch-connector": "^8.2.0"
  }

As we are running AWS ES @ 6.8, the documentation for the elasticsearch client says we should run 6.8 client version if we are using 6.8 server version, so we cannot upgrade to client version 7.8 ( See https://github.com/elastic/elasticsearch-js#compatibility ); Therefore, the solution of using the latest @elastic/elasticsearch is not an option for us.

Thanks

@compwright perhaps you should deprecate v8.3.0 as it was a breaking change.

I am getting authorization error aswell even when using AdministratorAccess policy: User: <arn> is not authorized to perform: es:ESHttpPost

I am using the following versions:

"@elastic/elasticsearch": "^7.9.1"
"aws-elasticsearch-connector": "^9.0.0"
"aws-sdk": "^2.773.0"