ARM Template - Preview API

Hello,

1.

I would like to create a Service Bus (Preview) instead of the Service Bus, only available on the old portal.

This has to be done using Azure ARM Templating. How can i make use of the the Service Bus (Preview)? This is required because the current Service Bus event hubs are not available on the 'Stream Analytics Job'.

2.

Which name must be used in ARM Template to configure 'Message Retention'?
I tried:
- 'Message Retention'
- 'MessageRetention'
- 'MessageRetentionInDays' 

Thanks