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

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