I have a FlowFile and I want to insert the attributes into RDS.  If this was a local machine, I'd create a DBCPConnectionPool, reference a JDBC driver, etc.
With RDS, what am I supposed to do?  Something similar (how would I do this on AWS)?  Or am I stuck using ExecuteScript?  If it's the later, is there a Python example for how to do this?
Question might not have been clear based on the feedback, but here is the answer to get a NiFi (running on an AWS EC2 instance) communicating with an Amazon RDS instance:

On the EC2 instance, download the latest JDBC driver (wget "https://driver.jar")
(If needed) Move the JDBC driver into a safe folder.
Create the DBCPConnectionPool, referencing the fully-resolved file path to the driver.jar (helpful: use readlink -f driver.jar to get the path).
Don't forget -- under your AWS Security Groups, add an inbound rule that allows your EC2 instance to access RDS (under Source, you should put the security group of your EC2 instance).
How best to interact with AWS RDS Postgres via NiFi