Proper access policy for Amazon Elastic Search Cluster

You can lock access down to IAM-only, but how will you view Kibana in your browser? You could setup a proxy (see Gist and/or NPM module) or enable both IAM and IP-based access for viewing results.

I was able to get both IAM access IP-restricted access with the following Access Policy. Note the order is important: I could not get it working with the IP-based statement before the IAM statement.

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Principal": {
        "AWS": "arn:aws:iam::xxxxxxxxxxxx:root"
      },
      "Action": "es:*",
      "Resource": "arn:aws:es:us-west-2:xxxxxxxxxxxx:domain/my-elasticsearch-domain/*"
    },
    {
      "Sid": "",
      "Effect": "Allow",
      "Principal": {
        "AWS": "*"
      },
      "Action": "es:*",
      "Resource": "arn:aws:es:us-west-2:xxxxxxxxxxxx:domain/my-elasticsearch-domain/*",
      "Condition": {
        "IpAddress": {
          "aws:SourceIp": [
            "192.168.1.0",
            "192.168.1.1"
          ]
        }
      }
    }
  ]
}

My EC2 instance has an instance profile with the
arn:aws:iam::aws:policy/AmazonESFullAccess
policy. Logstash should sign requests using the logstash-output-amazon-es output plugin. Logstash running on my EC2 instance includes an output section like this:

output {
    amazon_es {
        hosts => ["ELASTICSEARCH_HOST"]
        region => "AWS_REGION"
    }
    # If you need to do some testing & debugging, uncomment this line:
    # stdout { codec => rubydebug }
}

I can access Kibana from the two IPs in the access policy (192.168.1.0 and 192.168.1.1).