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eb15b61e32
This switches the full-text search plugin from fts-xapian to
fts-flatcurve, the now preferred indexer still powered by Xapian,
which will be integrated into Dovecot core 2.4.
This sets a sane minimal configuration for the plugin with
international language support.
The plugin options marked as "advanced" in Dovecot's documentation
aren't re-exposed for simplicity. They can nevertheless be overridden
by module consumers by directly setting keys with
`services.dovecot2.pluginSettings.fts_*`.
The `fullTextSearch.{memoryLimit,maintenance}` options are removed as
they are no longer needed for this plugin, which tops at 256MB of RAM
usage by default and incrementally optimises its index.
GitLab: closes https://gitlab.com/simple-nixos-mailserver/nixos-mailserver/-/issues/239
