AWS::ElastiCache::SecurityGroupIngress:

Properties:
  CacheSecurityGroupName: "\"The name of the Cache Security Group to authorize.\""
  EC2SecurityGroupName: "\"Name of the EC2 Security Group to include in the authorization.\""
  EC2SecurityGroupOwnerId: "\"Specifies the AWS Account ID of the owner of the EC2 security group specified in the EC2SecurityGroupName property. The AWS access key ID is not an acceptable value.\""