@SdkInternalApi
    public boolean isRetryable() {
        return true;
    }
Returns a hint as to whether it makes sense to retry upon this exception.
Default is true, but subclass may override.

This method is internal to the SDK. Users should not depend on this method to decide
if an exception from a service should be retried.
aws-java-sdk-core/src/main/java/com/amazonaws/AmazonClientException.java