Just to bring up to a conclusion, I have finally solved my issue by creating a custom Analyzer for use with the SynonymFilter. It is not as "declarative" as I would have hoped, but at least it works :)
Greetings, *Raf* On Wed, Sep 28, 2016 at 9:26 AM, Raf <r.ventag...@gmail.com> wrote: > On Wed, Sep 28, 2016 at 3:21 AM, Alexandre Rafalovitch <arafa...@gmail.com > > wrote: > >> Before you go down this rabbit hole, are you actually sure this does >> what you think it does? >> >> As far as I can tell, that parameter is for analyzing/parsing the >> synonym entries in the synonym file. Not the incoming search queries >> or text actually being indexed. > > > > Yes, this is exactly what I am looking for. > > I have already customized my indexing and query analyzer for that field, > by using a custom filter that performs lemmatization for the Italian > language. > Hence, the token I have in my index (or in the parsed query) are something > like evento_n (event -> noun) or mangiare_v (eat -> verb). > > Now I would like to define synonyms without having to know the "lemma" > form. > > For example, I would like to have in my synonyms file: > evento,festa,spettacolo > and make the *SynonymFilter* analyzer transform them in > *evento_n,festa_n,spettacolo_n* > > This way, a query like *myField:spettacoli* (the plural form of > *spettacolo*) would be analyzed as *myField:(spettacolo_n evento_n > festa_n)*. > > > >> Did you get it to work with the simpler configuration? >> > > Yes, I carried out an experiment using the standard Lucene ItalianAnalyzer > class (both at indexing and query time and for the SynonymFilter) and it > works the way I was expecting. Unfortunately I cannot use this analyzer > because I have to apply my custom lemmatization filter. > > Therefore, I am confident I can achieve my desired result by defining a > custom Analyzer class, but I would have preferred to be able to alter the > filter chain just modifying the *schema.xml* file. > > Is there an alternative way to achieve the same result I am not seeing? > > Thank you very much for your help. > > > Bye, > *Raf* > > > >> >> Just double checking. >> >> Regards, >> Alex. >> ---- >> Newsletter and resources for Solr beginners and intermediates: >> http://www.solr-start.com/ >> >> >> On 27 September 2016 at 22:45, Raf <r.ventag...@gmail.com> wrote: >> > On Tue, Sep 27, 2016 at 4:22 PM, Alexandre Rafalovitch < >> arafa...@gmail.com> >> > wrote: >> > >> >> Looking at the code (on GitHub is easiest), it can take either >> >> analyzer or tokenizer but definitely not any chain definitions. This >> >> seems to be the same all the way to 6.2.1. >> >> >> > >> > Thanks for your answer Alex. >> > >> > Does anyone know if it exists a viable alternative to make it >> configurable >> > inside the schema.xml instead of defining a custom Java class? >> > >> > I was thinking about something like: >> > >> > * defining the *analyzer* outside of the *field* element, giving it a >> name: >> > <analyzer name="myAnalyzer"> >> > <tokenizer class="MyTokenizer" /> >> > <filter class="solr.LowerCaseFilterFactory"/> >> > <filter class="MyFilter_1" /> >> > </analyzer> >> > >> > * referring to it inside the *SynonymFilter* definition by its name: >> > <filter class="solr.SynonymFilterFactory" synonyms="synonyms.txt" >> > ignoreCase="true" expand="true" analyzer="myAnalyzer"/> >> > >> > Unfortunately I have not found anything like this inside the Solr >> > documentation. >> > Is it possible to achieve something like that or the only solution is >> > writing a custom Java class for each combination filter I need to use >> for >> > synonyms analysis? >> > >> > Thanks. >> > >> > Bye, >> > *Raffaella* >> > >> > >> > ---- >> >> Newsletter and resources for Solr beginners and intermediates: >> >> http://www.solr-start.com/ >> >> >> >> >> >> On 27 September 2016 at 21:10, Raf <r.ventag...@gmail.com> wrote: >> >> > Hi, >> >> > is it possible to configure a custom analysis for synonyms the same >> way >> >> we >> >> > do for index/query field analysis? >> >> > >> >> > Reading the *SynonymFilter* documentation[0], I have found I can >> specify >> >> a >> >> > custom analyzer by writing its class name. >> >> > >> >> > Example: >> >> > <fieldType name="myField_it" class="solr.TextField" > >> >> > <analyzer> >> >> > <tokenizer class="MyTokenizer" /> >> >> > <filter class="solr.LowerCaseFilterFactory"/> >> >> > <filter class="MyFilter_1" /> >> >> > <filter class="MyFilter_2" /> >> >> > <filter class="solr.SynonymFilterFactory" >> >> synonyms="synonyms.txt" >> >> > ignoreCase="true" expand="true" >> >> > analyzer="org.apache.lucene.analysis.it.ItalianAnalyzer"/> >> >> > </analyzer> >> >> > </fieldType> >> >> > >> >> > >> >> > What I would like to achieve, instead, it is something like this: >> >> > <fieldType name="myField_it" class="solr.TextField"> >> >> > <analyzer> >> >> > <tokenizer class="MyTokenizer" /> >> >> > <filter class="solr.LowerCaseFilterFactory"/> >> >> > <filter class="MyFilter_1" /> >> >> > <filter class="MyFilter_2" /> >> >> > <filter class="solr.SynonymFilterFactory" >> >> synonyms="synonyms.txt" >> >> > ignoreCase="true" expand="true"> >> >> > <analyzer> >> >> > <tokenizer class="MyTokenizer" /> >> >> > <filter class="solr.LowerCaseFilterFactory"/> >> >> > <filter class="MyFilter_1" /> >> >> > </analyzer> >> >> > </filter> >> >> > </analyzer> >> >> > </fieldType> >> >> > >> >> > >> >> > I have tried to configure it this way, but it does not work. >> >> > I do not get any configuration error, but the custom analyzer is not >> >> > applied to synonyms. >> >> > >> >> > Is it possible to achieve this result by configuration or am I >> forced to >> >> > write a custom Analyzer class? >> >> > >> >> > I am currently using Solr 5.2.1. >> >> > At the moment I cannot upgrade to a newer version. >> >> > >> >> > >> >> > Thank you very much for any help you can provide. >> >> > >> >> > Regards, >> >> > *Raf* >> >> > >> >> > >> >> > [0] >> >> > http://archive.apache.org/dist/lucene/solr/ref-guide/ >> >> apache-solr-ref-guide-5.2.pdf >> >> > p. 132 >> >> >> > >
