feature-request: advance mailing list archives search by threads

Hi,

I always search from the mailing list archives.
https://www.postgresql.org/search/?m=1

This is very helpful for new developers like me to know what is
discussed in the past. But, I think it's better to add an option
to search by threads because there is a case to want to know not
only per message but also per discussion.

For example, although the number of the following query's result is 53,
the number of the unique thread is almost only 10.
https://www.postgresql.org/search/?m=1&q=wal+writer&l=1&d=365&s=r

What do you think?

Best Regards,
-- 
Masahiro Ikeda
NTT DATA CORPORATION