}
                return SearchResult.create().build();
            }
        }).toArray(n -> new SearchResult[n]);

        final String scoreField = fessConfig.getRankFusionScoreField();
        final Map<String, Map<String, Object>> scoreDocMap = new HashMap<>();
        final String idField = fessConfig.getIndexFieldId();
        final Set<Object> mainIdSet = new HashSet<>();

     * The value is, e.g. rf_score <br>
     * comment: Score field for rank fusion.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getRankFusionScoreField();

    /**
     * Get the value for the key 'smb.role.from.file'. <br>
     * The value is, e.g. true <br>
     * comment: Whether to get SMB roles from a file.