Costumizing the ordering values based on the specific value in the column in django-elasticsearch-dsl-drf

[zahidsw]

@api_view(['POST'])
@permission_classes((IsAuthenticated,))
def api_training_recommendation_view(request, Sku):
try:

    recommendations = Recommendation.objects.all()
except Recommendation.DoesNotExist:
    return Response(status=status.HTTP_404_NOT_FOUND)

try:
    recommendation = Recommendation.objects.filter(Sku=Sku)
    print(recommendation)
except Recommendation.DoesNotExist:
    return Response(status=status.HTTP_404_NOT_FOUND)

if request.method == 'POST':
    serializer_recommendations = RecommendationSerializer(recommendations, many=True)
    serializer_recommendation = RecommendationSerializer(recommendation)
    encoded_data = encoding_data(recommendations,recommendation)
    df_dicts = encoded_data.to_dict().values()
    return Response(df_dicts)
return Response(recommendation.errors, status=status.HTTP_400_BAD_REQUEST)

class PublisherDocumentView(DocumentViewSet):
document = RecommendationDocument
serializer_class = RecommendationElasicSerializer
lookup_field = 'first_name'
fielddata = True
filter_backends = [
FilteringFilterBackend,
OrderingFilterBackend,
CompoundSearchFilterBackend,
FilteringFilterBackend,
OrderingFilterBackend,
DefaultOrderingFilterBackend,
SearchFilterBackend,
SuggesterFilterBackend, # This should be the last backend
]

search_fields = (
    'sku','artikelNr1','artikelNr2', 'statusCode' ,'statusText' ,'saisonRetourenCode','saisonRetourenText','saisonCode','saisonText','geschlechtCode','geschlechtText','rayonCode','rayonText','warenArtCode','warenArtText','wuCode','wuText','waCode','warenGruppe','alterCode','farbe','material','bezeichnung','pictureName','picturePathLocal','kollektion','comCode' ,'lieferant','eKchf','eti','vp','groessenCode','categories','groessen','zlQty',  'productId','published','productName','shortDescription','fullDescription','flag'
)
multi_match_search_fields = (
    'sku','artikelNr1','artikelNr2', 'statusCode' ,'statusText' ,'saisonRetourenCode','saisonRetourenText','saisonCode','saisonText','geschlechtCode','geschlechtText','rayonCode','rayonText','warenArtCode','warenArtText','wuCode','wuText','waCode','warenGruppe','alterCode','farbe','material','bezeichnung','pictureName','picturePathLocal','kollektion','comCode' ,'lieferant','eKchf','eti','vp','groessenCode','categories','groessen','zlQty',  'productId','published','productName','shortDescription','fullDescription','flag'
)
filter_fields = {
    'artikelNr1': 'artikelNr1.raw',
    'artikelNr2': 'artikelNr2.raw',
    'statusText': 'statusText.raw',
    'flag.raw': {
                        'field': 'flag.raw',
                        'lookups': [
                            LOOKUP_FILTER_TERMS,
                            LOOKUP_FILTER_PREFIX,
                            LOOKUP_FILTER_WILDCARD,
                            LOOKUP_QUERY_IN,
                            LOOKUP_QUERY_EXCLUDE,
                        ],
                    },
}
ordering_fields = {
    'flag': 'flag.raw',
}
ordering = ('flag')

I want to costumizing the ordering of this flag field. does anybody has any idea how to do it?