docs: def get_canonical_index(self, alias):
          """
          RETURN THE INDEX USED BY THIS alias
          THIS IS ACCORDING TO THE STRICT LIFECYCLE RULES:
          THERE IS ONLY ONE INDEX WITH AN ALIAS
          """
          output = jx.sort(set(
              i
              for ai in self.get_aliases()
              for a, i in [(ai.alias, ai.index)]
              if a == alias or i == alias or (re.match(re.escape(alias) + "\\d{8}_\\d{6}", i) and i != alias)
          ))
  
          if len(output) > 1:
              Log.error("only one index with given alias==\"{{alias}}\" expected", alias=alias)
  
          if not output:
              return Null
  
          return output.last()