How to read AWS SNS JSON message through Lambda Subscriber put in on-premises Elasticsearch DB?

I am not familiar with a reference architecture, but what you will need is the following:

1. A Lambda function that is invoked every time a message is sent to an SNS topic (the function is invoked, with the message payload in the event object, it does not read the message from SNS).
2. Attach the function to a VPC, which has some connection to the on-premises network.
3. The function will make a REST call to the Elasticsearch endpoint on-premises.