docs: def map_to_es(self):
          """
          RETURN A MAP FROM THE NAMESPACE TO THE es_column NAME
          """
          output = {}
          for path in self.query_path:
              set_default(
                  output,
                  {
                      k: c.es_column
                      for c in self.columns
                      if c.jx_type not in STRUCT
                      for rel_name in [relative_field(c.name, path)]
                      for k in [rel_name, untype_path(rel_name), unnest_path(rel_name)]
                  }
              )
          return output