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Lucene Full Text Search Indexing ================================ *NOTE*: Although the fts-lucene plugin works, it's using CLucene library, which is very old and has some bugs. It's a much better idea to use <fts-solr> [Plugins.FTS.Solr.txt] instead, which has much more features and is more stable. Requires Dovecot v2.1+ to work properly. The CLucene version must be v2.3 (not v0.9).Dovecot builds only a single Lucene index for all mailboxes. The Lucene indexes are stored in 'lucene-indexes/' directory under the mail root index directory (e.g.'~/Maildir/lucene-indexes/'). Compilation ----------- If you compile Dovecot yourself, you must add the following switches to your configure command for the plugin to be built: ---%<------------------------------------------------------------------------- --with-lucene --with-stemmer ---%<------------------------------------------------------------------------- The second switch is only required if you have compiled libstemmer yourself or if it's included in the CLucene you are using. Configuration ------------- Into 10-mail.conf (note add existing plugins to string) ---%<------------------------------------------------------------------------- mail_plugins = $mail_plugins fts fts_lucene ---%<------------------------------------------------------------------------- Into 90-plugins.conf ---%<------------------------------------------------------------------------- plugin { fts = lucene # Lucene-specific settings, good ones are: fts_lucene = whitespace_chars=@. } ---%<------------------------------------------------------------------------- The fts-lucene settings include: * whitespace_chars=<chars>: List of characters that are translated to whitespace. You may want to use "@." so that e.g. in "'first.last@example.org'" it won't be treated as a single word, but rather you can search separately for "first", "last" and "example". * default_language=<lang>: Default stemming language to use for mails. The default is english. Requires that Dovecot is built with libstemmer, which also limits the languages that are supported. * textcat_conf=<path> textcat_dir=<path>: If specified, enable guessing the stemming language for emails and search keywords. This is a little bit problematic in practice, since indexing and searching languages may differ and may not find even exact words because they stem differently. * no_snowball: Support normalization of indexed words even without stemming and libstemmer (Snowball). (v2.2.3+) * mime_parts: Index each MIME part separately and include the MIME part number in the "part" field. In future versions this will allowing showing which attachment matched the search result. (v2.2.13+) Libraries --------- * CLucene [http://sourceforge.net/projects/clucene/files/]: Get v2.3.3.4 (not v0.9) * libstemmer [http://snowball.tartarus.org/download.php]: Builds libstemmer.o, which you can rename to libstemmer.a * textcat [http://textcat.sourceforge.net/] (This file was created from the wiki on 2019-06-19 12:42)
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