code: def get_simple_info_for_index(self, index=None, params={}, **kwargs):
          
          raw = self.client.cat.indices(index, params=params, **kwargs).split('\n')
          list = []
          for r in raw:
              alter = r.split(' ')
              if len(alter) < 10: continue
              dict = {
                  'health': alter[0],
                  'status': alter[1],
                  'index': alter[2],
              }
              if len(alter) == 11:
                  # May appear split fail (alter[3] is a empty string)
                  dict['uuid'] = alter[4]
                  i = 5
              else:
                  dict['uuid'] = alter[3]
                  i = 4
              dict['pri'] = alter[i]
              i += 1
              dict['rep'] = alter[i]
              i += 1
              dict['docs_count'] = alter[i]
              i += 1
              dict['docs_deleted'] = alter[i]
              i += 1
              dict['store_size'] = alter[i]
              i += 1
              dict['pri_store_size'] = alter[i]
              list.append(dict)
          logger.info('Acquire simple information of the index is done succeeded: %s' % len(list))
          return list
docs: Return a list of simple info by specified index (default all), each elements is a dictionary
          such as
          {
              'health' : 'green', 'status' : 'open',
              'index' : 'xxxx', 'uuid' : 'xxxx',
              'pri' : 1, 'rep' : 1,
              `docs_count` : 4, 'docs_deleted' : 0,
              'store_size' : 10kb, 'pri_store_size' : 10kb
          }