建议使用更多的较小实例，因为它们可以更好地适应高度动态的工作负载。而且，它们还具有弹性，能够自动缩放以适应不同的工作量。以下是一个示例代码，它使用AWS CloudFormation部署一个包含4个t2.micro实例的OpenSearch集群。

AWSTemplateFormatVersion: '2010-09-09'
Resources:
  OpenSearchCluster:
    Type: 'AWS::OpenSearchService::Domain'
    Properties:
      DomainName: my-opensearch-domain
      ElasticsearchVersion: '7.10'
      ElasticsearchClusterConfig:
        InstanceType: t2.micro.opensearch
        InstanceCount: 4
        DedicatedMasterEnabled: true
        DedicatedMasterCount: 3
        ZoneAwarenessEnabled: true
        ZoneAwarenessConfig:
          AvailabilityZoneCount: 2
      EBSOptions:
        EBSEnabled: true
        VolumeType: gp2
        VolumeSize: 10
      AccessPolicies:
        Version: '2012-10-17'
        Statement:
          - Effect: Allow
            Principal:
              AWS: '*'
            Action: 'es:*'
            Resource: '*'
Outputs:
  OpenSearchClusterEndpoint:
    Description: The endpoint of the OpenSearch cluster
    Value: !Sub 'https://${OpenSearchCluster.DomainName}'