refresh/rebuild akonadi database

Being on KDE 4.9 on Kubuntu 12.04 I am quite happy with KMail/Kontact 
once more. Filters mainly work (they do go belly up now and then but 
nothing I can not deal with), lists/groups work and so on.

I have one gripe though: searching for mail/messages. It is showing far 
from the expected number of emails if I search for "internet" in "all 
folders" (believe me I have many mails on that subject). Same goes for 
other terms I know I use often in subject line.

I am kind of suspecting that Akonadi thinks it has done the indexing and 
all is good, seeing the number of upgrades I have done. Does anyone know 
if there is a way (apart from removing the database altogether) to 
instruct Akonadi to redo the job?

There are some pointers in that direction here in KDE forums but no 
deeper explanation of the parameters:

http://forum.kde.org/viewtopic.php?f=215&t=98857

kind regards,
Sinclair
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