Add fts_filters

core/dovecot/conf/dovecot.conf

@@ -63,6 +63,8 @@ plugin {
   fts_autoindex = yes
   fts_enforced = yes
   fts_autoindex_exclude = \Trash
+  fts_filters = normalizer-icu stopwords
+  fts_filters_en = lowercase english-possessive stopwords
   {% endif %}
 
   {% if COMPRESSION in [ 'gz', 'bz2', 'lz4', 'zstd' ] %}