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我正在尝试在AWS上创建一个VPC控制的弹性搜索服务.问题是我在运行以下代码时不断收到错误:'ValidationException:在继续操作之前,必须启用服务链接角色以授予Amazon ES访问VPC的权限'.

const AWS = require('aws-sdk');
AWS.config.update({region:'<aws-datacenter>'});
const accessPolicies = {
  Statement: [{
    Effect: "Allow",
    Principal: {
      AWS: "*"
    },
    Action: "es:*",
    Resource: "arn:aws:es:<dc>:<accountid>:domain/<domain-name/*"
  }]
};
const params = {
  DomainName: '<domain>',
  /* required */
  AccessPolicies: JSON.stringify(accessPolicies),
  AdvancedOptions: {
    EBSEnabled: "true",
    VolumeType: "io1",
    VolumeSize: "100",
    Iops: "1000"
  },
  EBSOptions: {
    EBSEnabled: true,
    Iops: 1000,
    VolumeSize: 100,
    VolumeType: "io1"
  },
  ElasticsearchClusterConfig: {
    DedicatedMasterCount: 3,
    DedicatedMasterEnabled: true,
    DedicatedMasterType: "m4.large.elasticsearch",
    InstanceCount: 2,
    InstanceType: 'm4.xlarge.elasticsearch',
    ZoneAwarenessEnabled: true
  },
  ElasticsearchVersion: '5.5',
  SnapshotOptions: {
    AutomatedSnapshotStartHour: 3 …