Sieve Symlink Creation

[dovecot]

The first time when the sieve files and folders get created, the active symlink 
is created as a full absolute path

    .active_sieve -> /mnt/email/domain/user/_sieve/filters.sieve

After that, if you disable and enable the rule set the symlink gets recreated 
as relative

    .active_sieve -> filters.sieve

How can i have the symlink always created as a relative path even on first time 
creation?
Having a full absolute path over a mounted NSF is fragile.

Dovecot 2.3.16
Pigeonhole 2.3.16

mail_home = /mnt/email/%d/%n/_dovecot
mail_location = 
maildir:/mnt/email/%d/%n/_folders:INDEX=/mnt/email/%d/%n/_dovecot:CONTROL=/mnt/email/%d/%n/_dovecot
plugin {
  sieve = file:~/../_sieve;active=~/../_sieve/.active_sieve
  sieve_max_script_size = 1M
  sieve_max_actions = 32
  sieve_max_redirects = 4
  sieve_quota_max_scripts = 20
  sieve_quota_max_storage = 5M
  sieve_vacation_min_period = 1d
  sieve_vacation_use_original_recipient = no
  sieve_vacation_dont_check_recipient = no
  sieve_vacation_send_from_recipient = no
  sieve_redirect_envelope_from = sender
  sieve_user_email = %u
}