Can't use i3 instance type with Elasticsearch

[CVirus]

Describe the bug
I'm trying to deploy an elasticsearch domain with the following configuration and it is failing:

    CidrSize: 27
    EngineVersion: 6.7
    ESDomainName: "graylog-cvirus-test"
    NodeAvailabilityZones: 2
    NodeInstanceType: i3.xlarge.elasticsearch
    StorageType: standard
    NodeInstanceCount: 6
    DedicatedMasterInstanceType: c5.large.elasticsearch
    DedicatedMasterInstanceCount: 3
    PreferredSnapshotTime: 0
    NodeToNodeEncryption: true
    EncryptionAtRest: true

The error:
CloudFormationError; Description: ElasticsearchDomain Instance type i3.xlarge.elasticsearch does not support EBS storage

Expected behavior
I expect ES domain to be created.

Environment:

• Application Platform: Kubernetes
• Application Platform Version: k8s 1.16.8
• Broker Version:1.0.1

[rniksch]

Looking into this as a possible change that need to be made to the template. so when selecting i3 instance types that the correct storage match is done. https://docs.aws.amazon.com/elasticsearch-service/latest/developerguide/aes-supported-instance-types.html

I just want to confirm your requirements:
do you specifically need the i3 instance type? can you provide some detail on the use case vs other instance type?

and do you have specific requirements around the storage ?

having this info will help us cater for customer use cases

[CVirus]

@rniksch Thanks for your reply. We decided on i3 instance type because we were migrating an old elasticsearch cluster that is already using them. i3 was decided for because it comes with its own storage.
Since the broker CF template didn't support that; we decided to go for r5 instances + EBS storage.
I came to realize that the CF template is not flexible enough and at some point we're going to end up creating our own catalog with our own templates.