presto-elasticsearch/src/main/java/io/prestosql/elasticsearch/ElasticsearchPageSource.java/ElasticsearchPageSource/close
class ElasticsearchPageSource:        public void close()
        {
            if (scrollId != null) {
                try {
                    client.clearScroll(scrollId);
                }
                catch (Exception e) {
                    // ignore
                    LOG.debug("Error clearing scroll", e);
                }
            }
        }