serverless.yml

service: 
    name: schedule-python-oai-example    
provider:
 name: aws
 runtime: python3.6
 memorySize: 128
 timeout: 10
 stage: production
 region: us-east-1
 environment:
   ESURL:
     Fn::GetAtt: [ ElasticSearchInstance , DomainEndpoint ]
 iamRoleStatements:
    - Effect: Allow
      Action:
       - es:ESHttp*
      Resource: { "Fn::GetAtt": ["ElasticSearchInstance", "DomainArn" ] }            

functions:
    indexCollectionEarthquake: 
        handler: handler.run
        events:
         - schedule:
            rate: cron(0 14 * * ? *)
            enabled: true                    

resources:
  Resources:
    ElasticSearchInstance:      
      Type: AWS::Elasticsearch::Domain
      Properties:
        DomainName: test-item-es-instance
        EBSOptions:
          EBSEnabled: true
          VolumeType: gp2
          VolumeSize: 10
        ElasticsearchClusterConfig:
          InstanceType: t2.small.elasticsearch
          InstanceCount: 1
          DedicatedMasterEnabled: false
          ZoneAwarenessEnabled: false
        ElasticsearchVersion: 6.4