relispartition for index partitions

Hi.

I noticed that relispartition isn't set for index's partitions.

create table p (a int) partition by list (a);
create table p12 partition of p for values in (1, 2);
create index on p (a);
select relname, relkind from pg_class where relnamespace =
'public'::regnamespace and relispartition is true;
relname | relkind
---------+---------
p12 | r
(1 row)

Is that intentional?

Thanks,
Amit