dsync: When initializing via doveadm-server, change the iostream buffer sizes to unlimited.
dsync: When initializing via doveadm-server, change the iostream buffer sizes to unlimited.

jwm/dovecot-notmuch,jwm/dovecot-notmuch,jwm/dovecot-notmuch,jwm/dovecot-notmuch,jwm/dovecot-notmuch