[GitHub] [flink] skidder opened a new pull request #8444: [FLINK-10190] [Kinesis Connector] Allow AWS_REGION to be supplied along with custom Kinesis endpoint

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skidder opened a new pull request #8444: [FLINK-10190] [Kinesis Connector] Allow AWS_REGION to be supplied along with custom Kinesis endpoint
URL: https://github.com/apache/flink/pull/8444
 
 
   ## What is the purpose of the change
   
   Allow an AWS region (e.g. `us-east-1`) to be supplied along with a custom Kinesis endpoint in the Kinesis configuration.
   
   Using a [Kinesis VPC endpoint](https://aws.amazon.com/blogs/aws/new-aws-privatelink-endpoints-kinesis-ec2-systems-manager-and-elb-apis-in-your-vpc/) can prevent traffic leaving the AWS network. This greatly reduces costs by eliminating NAT traversal and cross-AZ transfers. However, this requires that the Kinesis endpoint URL be signed for a specific region. This is accomplished by including the region name along with the endpoint URL when constructing the Kinesis client.
   
   ## Brief change log
   
     - Permit both region and endpoint to be set
     - Set the region on the endpoint configuration when both region and endpoint are set
   
   ## Verifying this change
   
   This change added tests and can be verified by running connector unit tests.
   
   ## Does this pull request potentially affect one of the following parts:
   
   No
   
   ## Documentation
   
   Documentation for the Kinesis connector has been updated.

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