@Override
    protected AmazonConfigAsync build(AwsAsyncClientParams params) {
        return new AmazonConfigAsyncClient(params);
    }
Construct an asynchronous implementation of AmazonConfigAsync using the current builder configuration.

@param params
       Current builder configuration represented as a parameter object.
@return Fully configured implementation of AmazonConfigAsync.
aws-java-sdk-config/src/main/java/com/amazonaws/services/config/AmazonConfigAsyncClientBuilder.java