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

@param params
       Current builder configuration represented as a parameter object.
@return Fully configured implementation of AmazonKinesisFirehoseAsync.
aws-java-sdk-kinesis/src/main/java/com/amazonaws/services/kinesisfirehose/AmazonKinesisFirehoseAsyncClientBuilder.java