FTS-lucene errors : language not available for stemming

[David Gessel]

I'm getting some log errors with clucene that I am having no luck tracking down on the interwebs.


Errors:

May 19 05:05:16 indexer-worker(gessel at blackrosetech.com)<62971><aPAEI3zLw17A/QAA0J78UA:EF25M3zLw1779QAA0J78UA>: Error: lucene index /mail/blackrosetech.com/gessel//lucene-indexes: IndexWriter::addDocument() failed (#4): language not available for stemming
May 19 05:05:16 indexer-worker: Error:
May 19 05:05:16 indexer-worker(gessel at blackrosetech.com)<62971><aPAEI3zLw17A/QAA0J78UA:EF25M3zLw1779QAA0J78UA>: Error: Mailbox Security: Mail search failed: Internal error occurred. Refer to server log for more information. [2020-05-19 05:05:16]
May 19 05:05:16 indexer-worker(gessel at blackrosetech.com)<62971><aPAEI3zLw17A/QAA0J78UA:EF25M3zLw1779QAA0J78UA>: Error: Mailbox Security: Transaction commit failed: FTS transaction commit failed: transaction context (attempted to index 1 messages (UIDs 152736..152736))


Config:

FreeBSD 11.3-RELEASE-p8 #0 r360490

dovecot-2.3.10_3

clucene-2.3.3.4_19

py37-pystemmer-2.0.0.1

py37-snowballstemmer-1.2.1

icu-67.1,1

plugin {
   #setting_name = value
         expire = Trash
         mail_log_events = delete undelete expunge copy mailbox_delete mailbox_rename
         mail_log_fields = uid box msgid size
         fts_autoindex=yes
         #zlib_save_level = 6 # 1..9
         #zlib_save = gz # or bz2
}

plugin {
   fts = lucene
   # Lucene-specific settings, good ones are:
   fts_lucene = whitespace_chars=@. mime_parts
}



I am considering switch to xapian (solr and java... pls noe) as the port is quite tempting from an ease of integration perspective, but the easiest solution would be to resolve these odd indexing errors.  Anyone have a clue?

-David