首先，在ElasticSearch的访问策略中找到明确拒绝访问的规则，并将其修改为允许访问或删除该规则。例如，以下访问策略明确拒绝所有IP地址访问ElasticSearch：

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Deny",
      "Principal": "*",
      "Action": "*",
      "Resource": "arn:aws:es:us-west-2:123456789012:domain/my-domain/*",
      "Condition": {
        "IpAddress": {
          "aws:SourceIp": "192.0.2.0/24"
        }
      }
    }
  ]
}

可以将其改为允许该IP地址访问，如下所示：

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Principal": "*",
      "Action": "*",
      "Resource": "arn:aws:es:us-west-2:123456789012:domain/my-domain/*",
      "Condition": {
        "IpAddress": {
          "aws:SourceIp": "192.0.2.0/24"
        }
      }
    }
  ]
}

或者也可以删除该规则，如下所示：

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Principal": "*",
      "Action": "*",
      "Resource": "arn:aws:es:us-west-2:123456789012:domain/my-domain/*"
    }
  ]
}

注意：在执行任何更改之前，请确保您了解本次更改的风险，并验证访问策略的正确性。