I surmise that you are using the "text_it" field type, or something similar.
It has:
<filter class="solr.ItalianLightStemFilterFactory"/>
When I enter "trento" into the Solr admin analysis page that last filter
transforms "trento" into "trent", just as we see in the query explain.
So, indeed, this looks like a stemming anomaly.
I see this comment in the code: "To prevent terms from being stemmed use an
instance of KeywordMarkerFilter", so you could use
"solr.KeywordMarkerFilterFactory" and created a protected words list text
file.
-- Jack Krupansky
-----Original Message-----
From: mattia.martine...@gmail.com
Sent: Monday, August 27, 2012 1:18 PM
To: solr-user@lucene.apache.org
Subject: Re: Understanding SOLR search results
Maybe you have a synonym in the title field? Or maybe some stemming
anomaly?
The complete title is "Moschea in viale Trento, partono i lavori", so
"Trent" should be a substring of the word "Trento".
But if I search for "Mos" or "lavo", I don't have this result, so I
don't understand why "Trent" is taken as a subword, and "Mos" and
"lavo" are not.
Do you have any idea?
