There is a volume size restriction in EBS for ElasticSearch. VolumeType can be found here.
Creation / deletion takes 10 minutes for 10G EBC volume size. This is the most time-consuming step in deployment. The default setting is 35G.
${AWS::Region}:${AWS::AccountId} will be substituted by CloudFormation automatically [1].
Step-by-step guide
The file that you need to edit is node_modules/@cumulus/deployment/app/config.yml for permanent change or your own app/config.yml.
Volume size must be between 10 and 35 for t2.small.elasticsearch instance type and elasticsearch version 5.3 (Service: AWSElasticsearch; Status Code: 409; Error Code: LimitExceededException; Request ID: 052cf8de-5252-11e9-8b96-f7c2339e0758)
es: null in config.yml will disable ElasticSearch.