dovecot: migrated config to 2.4 + config splitting

data/conf/dovecot/conf.d/35-fts.conf

@@ -0,0 +1,45 @@
+# mailcow FTS Flatcurve Settings, change them as you like.
+
+# Maximum term length can be set via the 'maxlen' argument (maxlen is
+# specified in bytes, not number of UTF-8 characters)
+language_tokenizer_address_token_maxlen = 100
+language_tokenizer_generic_algorithm = simple
+language_tokenizer_generic_token_maxlen = 30
+
+# These are not flatcurve settings, but required for Dovecot FTS. See
+# Dovecot FTS Configuration link above for further information.
+language en {
+  default = yes
+  language_filters = lowercase snowball english-possessive stopwords
+}
+
+language de {
+  language_filters = lowercase snowball stopwords
+}
+
+language es {
+  language_filters = lowercase snowball stopwords
+}
+
+language_tokenizers = generic email-address
+
+fts_search_timeout = 300s
+
+fts_autoindex = yes
+# Tweak this setting if you only want to ensure big and frequent folders are indexed, not all.
+fts_autoindex_max_recent_msgs = 20
+fts flatcurve {
+  substring_search = no
+}
+
+### THIS PART WILL BE CHANGED BY MODIFYING mailcow.conf AUTOMATICALLY DURING RUNTIME! ###
+
+service indexer-worker {
+  # Max amount of simultaniously running indexer jobs.
+  process_limit=1
+
+  # Max amount of RAM used by EACH indexer process.
+  vsz_limit=128 MB
+}
+
+### THIS PART WILL BE CHANGED BY MODIFYING mailcow.conf AUTOMATICALLY DURING RUNTIME! ###