code: def get_external_store(self, project_name, store_name):
          
  
          headers = {}
          params = {}
          resource = "/externalstores/" + store_name
          (resp, header) = self._send("GET", project_name, None, resource, params, headers)
  
          # add storeName if not existing
          if 'externalStoreName' not in resp:
              resp['externalStoreName'] = store_name
  
          return GetExternalStoreResponse(resp, header)
docs: get the logstore meta info
          Unsuccessful opertaion will cause an LogException.
  
          :type project_name: string
          :param project_name: the Project name 
  
          :type store_name: string
          :param store_name: the logstore name
  
          :return: GetLogStoreResponse
          
          :raise: LogException