presto-elasticsearch/src/main/java/io/prestosql/elasticsearch/ElasticsearchMetadata.java/ElasticsearchMetadata/ElasticsearchMetadata
class ElasticsearchMetadata:    @Inject
    public ElasticsearchMetadata(ElasticsearchClient client, ElasticsearchConfig config)
    {
        requireNonNull(config, "config is null");

        this.client = requireNonNull(client, "client is null");
        this.schemaName = config.getDefaultSchema();
    }