TL;DR : Reach out to your account team and they can help you with your request. You might be better off going to Splunk Cloud and having PS move your on-prem data to the Cloud.
This depends on what you are trying to accomplish. If you want to have a single pane of glass for your ES deployment, then Mothership will aggregate your notable events from all of your ES deployments and have them available in your main Splunk deployment. You can then navigate to the notable event in the proper ES deployment and look at it in context.
If you want to move your data from on-prem to AWS, I would encourage you to use professional services especially if you are not accustom to Splunk. They can move your data and get it into your AWS or Splunk Cloud instance. You only need one license since you can point multiple indexers to a single license server. DO NOT USE A LOAD BALANCER (LB) for data being forwarded into Splunk, that will cause issues. Just use Splunk's native load balancing to spread the data between your forwarders and indexers.
... View more