For L<public-inbox-v2-format(5)> inboxes, this value is
multiplied by the number of Xapian shards. Thus a typical v2
inbox with 3 shards will flush every 3 megabytes by default
For L<public-inbox-v2-format(5)> inboxes, this value is
multiplied by the number of Xapian shards. Thus a typical v2
inbox with 3 shards will flush every 3 megabytes by default