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

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