public static void insertEntitiesInGDM(Map<String, Map<String, Long>> frequencyOfTopFrequentItems,
        String fileName, long rowsCount) {

    // NON FARE LA LISTA MA UNA MAPPA
    //List<Tuple2<String, Document>> docList = new LinkedList<Tuple2<String, Document>>();
    Map<String, List<Document>> docMap = new HashMap<>();

    for (Entry<String, Map<String, Long>> entry : frequencyOfTopFrequentItems.entrySet()) {
        String columnName = entry.getKey();
        String datasetColumnKey = fileName.replace(".",",") + "|%#-#%|" + columnName;
        Map<String, Long> topFrequentMap = entry.getValue();

        // FALLA QUI
        List<Document> docList = new LinkedList<>();

        for (Entry<String, Long> topFrequentEntry : topFrequentMap.entrySet()) {
            Integer topFrequentCount = topFrequentMap.entrySet().size();
            String entityName = topFrequentEntry.getKey();
            Long entityOccurrencies = topFrequentEntry.getValue();
            Document datasetAndColumnDocument = new Document("datasetAndColumn", datasetColumnKey);
            Document details = new Document("occurrencies", entityOccurrencies)
                                        .append("topFrequentCount", topFrequentCount);

            // Qui inizializzi la lista dentro la mappa
            docMap.putIfAbsent(entityName, new LinkedList<>());

            // Qui ottiene la lista associata all'entityName e ci aggiungi il documento
            docMap.get(entityName).add(details);

        }



    }

    /* ora ti giri tutta la mappa e per ogni chiave fai un insertMany */
    for (Entry<String, List<Document> entry : map.entrySet()) {
        String entityName = entry.getKey();
        List<Document> listDocs = entry.getValue();
        GDMENTITYDATABASE.getCollection(entityName).insertMany(listDocs);
    }

}