presto-elasticsearch/src/main/java/io/prestosql/elasticsearch/ElasticsearchPageSourceProvider.java/ElasticsearchPageSourceProvider/ElasticsearchPageSourceProvider
class ElasticsearchPageSourceProvider:    @Inject
    public ElasticsearchPageSourceProvider(ElasticsearchClient client)
    {
        this.client = requireNonNull(client, "client is null");
    }