if (doc != null && doc.get(idField) instanceof final String id) {
                    // Calculate RRF score: 1 / (rank_constant + rank)
                    final float rrfScore = 1.0f / (rankConstant + docRank);
                    if (documentsByIdMap.containsKey(id)) {
                        final Map<String, Object> existingDoc = documentsByIdMap.get(id);

labels.facet_filetype_txt=filetype:txt\t\
labels.facet_filetype_others=filetype:others\n\

# ranking

# Window size for rank fusion.
rank.fusion.window_size=200
# Rank constant for rank fusion.
rank.fusion.rank_constant=20
# Number of threads for rank fusion.
rank.fusion.threads=-1
# Score field for rank fusion.
rank.fusion.score_field=rf_score

# acl

# Whether to get SMB roles from a file.

    /**
     * Get the value for the key 'rank.fusion.rank_constant'. <br>
     * The value is, e.g. 20 <br>
     * comment: Rank constant for rank fusion.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getRankFusionRankConstant();

    /**
     * Get the value for the key 'rank.fusion.rank_constant' as {@link Integer}. <br>
     * The value is, e.g. 20 <br>