docs: def put_settings(self, app=None, index=None, settings=None, es=None):
          """Modify index settings.
  
          Index must exist already.
          """
          if not index:
              index = self.index
  
          if not app:
              app = self.app
  
          if not es:
              es = self.es
  
          if not settings:
              return
  
          for alias, old_settings in self.es.indices.get_settings(index=index).items():
              try:
                  if test_settings_contain(old_settings['settings']['index'], settings['settings']):
                      return
              except KeyError:
                  pass
  
          es.indices.close(index=index)
          es.indices.put_settings(index=index, body=settings)
          es.indices.open(index=index)