old_contents: from django.conf import settings
  from haystack.backends.elasticsearch_backend import ElasticsearchSearchBackend
  from haystack.backends.elasticsearch_backend import ElasticsearchSearchEngine
  
  # Elasticsearch + mecab-ko Configurate
  
  
  # Haystack's Elasticsearch Backend Configure
  class ConfigurableElasticBackend(ElasticsearchSearchBackend):
      DEFAULT_ANALYZER = 'korean_index'
  
      def __init__(self, connection_alias, **connection_options):
  
              super(ConfigurableElasticBackend, self).__init__(
                                      connection_alias, **connection_options)
  
              user_settings = getattr(settings, 'ELASTICSEARCH_INDEX_SETTINGS')
              user_analyzer = getattr(settings, 'ELASTICSEARCH_DEFAULT_ANALYZER')
  
              if user_settings:
                  setattr(self, 'DEFAULT_SETTINGS', user_settings)
              if user_analyzer:
                  setattr(self, 'DEFAULT_ANALYZER', user_analyzer)
  
      def build_schema(self, fields):
          content_field_name, mapping = super(ConfigurableElasticBackend, self).build_schema(fields)
          for field_name, field_class in fields.items():
              field_mapping = mapping[field_class.index_fieldname]
  
              if field_mapping['type'] == 'string' and field_class.indexed:
                  if not hasattr(field_class, 'facet_for') and not \
                                    field_class.field_type in('ngram', 'edge_ngram'):
                      field_mapping['analyzer'] = self.DEFAULT_ANALYZER
              mapping.update({field_class.index_fieldname: field_mapping})
          return (content_field_name, mapping)
  
  
  # Haystack's Elasticsearch Engine Configure
  class ConfigurableElasticSearchEngine(ElasticsearchSearchEngine):
      backend = ConfigurableElasticBackend
  
new_contents: from django.conf import settings
  from haystack.backends.elasticsearch_backend import ElasticsearchSearchBackend
  from haystack.backends.elasticsearch_backend import ElasticsearchSearchEngine
  from haystack.constants import DEFAULT_OPERATOR, DJANGO_CT, DJANGO_ID, FUZZY_MAX_EXPANSIONS, FUZZY_MIN_SIM, ID
  
  # Elasticsearch + mecab-ko Configurate
  
  
  # Haystack's Elasticsearch Backend Configure
  class ConfigurableElasticBackend(ElasticsearchSearchBackend):
  	pass
  
  
  # Haystack's Elasticsearch Engine Configure
  class ConfigurableElasticSearchEngine(ElasticsearchSearchEngine):
      backend = ConfigurableElasticBackend
  
subject: update : fail full text search