if (anchorList.isEmpty()) {
            return null;
        }

        final Set<RequestData> childUrlSet = new LinkedHashSet<>();
        for (final String anchor : anchorList) {
            childUrlSet.add(RequestDataBuilder.newRequestData().get().url(anchor).build());
        }
        return childUrlSet;
    }

    protected Set<RequestData> getChildUrlSet(final SearchEngineClient searchEngineClient, final String id) {

        // created
        final Date now = systemHelper.getCurrentTime();
        putResultDataBody(dataMap, fessConfig.getIndexFieldCreated(), now);
        // TODO anchor
        putResultDataBody(dataMap, fessConfig.getIndexFieldAnchor(), StringUtil.EMPTY);
        // mimetype
        putResultDataBody(dataMap, fessConfig.getIndexFieldMimetype(), mimeType);

    /** The key of the configuration. e.g. last_modified */
    String INDEX_FIELD_last_modified = "index.field.last_modified";

    /** The key of the configuration. e.g. anchor */
    String INDEX_FIELD_ANCHOR = "index.field.anchor";

    /** The key of the configuration. e.g. segment */
    String INDEX_FIELD_SEGMENT = "index.field.segment";

    /** The key of the configuration. e.g. role */

index.field.id=_id
index.field.version=_version
index.field.seq_no=_seq_no
index.field.primary_term=_primary_term
index.field.lang=lang
index.field.has_cache=has_cache
index.field.last_modified=last_modified
index.field.anchor=anchor
index.field.segment=segment
index.field.role=role
index.field.boost=boost
index.field.created=created
index.field.timestamp=timestamp
index.field.label=label
index.field.mimetype=mimetype

        defaultDataMap.put(fessConfig.getIndexFieldMimetype(), mimeType);
        // title
        // content
        // cache
        // digest
        // host
        // site
        // url
        // anchor
        // content_length
        // last_modified
        // id
        // virtual_host
        defaultDataMap.put(fessConfig.getIndexFieldVirtualHost(),

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        // created
        final Date now = systemHelper.getCurrentTime();
        putResultDataBody(dataMap, fessConfig.getIndexFieldCreated(), now);
        // anchor
        putResultDataBody(dataMap, fessConfig.getIndexFieldAnchor(), getAnchorList(document, responseData));
        // mimetype
        putResultDataBody(dataMap, fessConfig.getIndexFieldMimetype(), mimeType);

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          "match": "*_zh-tw",
          "mapping": {
            "type": "text",
            "analyzer": "empty_analyzer"
          }
        }
      }
    ],
    "properties": {
      "anchor": {
        "type": "keyword"
      },
      "boost": {
        "type": "float"
      },
      "click_count": {
        "type": "long"
      },
      "config_id": {
        "type": "keyword"

          "match": "*_zh-tw",
          "mapping": {
            "type": "text",
            "analyzer": "empty_analyzer"
          }
        }
      }
    ],
    "properties": {
      "anchor": {
        "type": "keyword"
      },
      "boost": {
        "type": "float"
      },
      "click_count": {
        "type": "long"
      },
      "config_id": {
        "type": "keyword"