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

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