docs: def setup_db(self, wait_for_ready=True):
          ''' Create and configure index
  
              If `wait_for_ready` is True, this function will block until
              status for `self.index_name` will be `yellow`
          '''
  
          if self.es.indices.exists(self.index_name):
              try:
                  self.update_mappings()
              except MappingsException as ex:
                  log.error(ex)
                  log.warn('An old or wrong properties mapping has been found for index: "{0}",\
                            this could led to some errors. It is recomanded to run "libreant-db upgrade"'.format(self.index_name))
          else:
              log.debug("Index is missing: '{0}'".format(self.index_name))
              self.create_index()
  
          if wait_for_ready:
              log.debug('waiting for index "{}" to be ready'.format(self.index_name))
              self.es.cluster.health(index=self.index_name, level='index', wait_for_status='yellow')
              log.debug('index "{}" is now ready'.format(self.index_name))