docs: public boolean indexExists(String name) throws IOException {
          CloseableHttpClient client = HttpClients.createDefault();
          HttpHead head = new HttpHead(String.format("http://%s:%d/%s", host, port, name));
          try {
              CloseableHttpResponse response = client.execute(head);
              return response.getStatusLine().getStatusCode() == HttpStatus.SC_OK;
          } finally {
              head.releaseConnection();
          }
      }