$ref: '#/components/responses/NotFound'
        '500':
          $ref: '#/components/responses/InternalServerError'
          
  /health:
    get:
      tags:
        - monitor
      summary: Check a server status
      description: Returns status
      operationId: ping
      responses:
        '200':
          description: Successful operation
          content:
            application/json:

        if (idx >= 0) {
            hostUrl = url.substring(0, idx);
        } else {
            hostUrl = url;
        }
        final String robotTxtUrl = hostUrl + "/robots.txt";

        // check url
        if (crawlerContext.getRobotsTxtUrlSet().contains(robotTxtUrl)) {
            if (logger.isDebugEnabled()) {
                logger.debug("{} is already visited.", robotTxtUrl);
            }

            final GetResponse response = getClient().get(c -> c.prepareGet(index, id).execute());
            return response.isExists();
        } catch (final Exception e) {
            throw new EsAccessException("Failed to check if " + sessionId + ":" + url + " exists.", e);
        }
    }

    public int getCount(final Consumer<SearchRequestBuilder> callback) {
        final TotalHits totalHits = getClient().get(c -> {