Dovecot FST not using plugins

[Joan Moreau]

Hello,

With recent git version of dovecot, I can see that the FTS does not use 
the configured plugin anymore, but tries to sort the mailbox directly on 
the spot (which is of course very painful).

Is there a change in the configuration file in order to recover the old 
behavior ? or something else has changed ?

Thank you

Joan
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