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

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