def get_index(self, field_name, catalog):
        """Returns the index of the catalog for the given field_name, if any
        """
        index = catalog.Indexes.get(field_name, None)
        if not index and field_name == "Title":
            # Legacy
            return self.get_index("sortable_title", catalog)
        return index
Returns the index of the catalog for the given field_name, if any