Hi Mike, thanks for suggesting this very interesting post. I've tried going deeper reading also:
https://issues.apache.org/jira/browse/LUCENE-6664 https://www.elastic.co/blog/multitoken-synonyms-and-graph-qu eries-in-elasticsearch https://lucidworks.com/2017/04/18/multi-word-synonyms-solr-a dds-query-time-support/ Not clear if and how I can have multiple SynonymGraphFilter in the same chain. Anyway, I've tried starting a new brand solr 7.1.0 instance and modifying the "text_general" fieldType: <fieldType name="text_general" class="solr.TextField" positionIncrementGap="100" multiValued="true"> <analyzer type="index"> <tokenizer class="solr.StandardTokenizerFactory"/> <filter class="solr.StopFilterFactory" words="stopwords.txt" ignoreCase="true"/> <filter class="solr.SynonymGraphFilterFactory" expand="true" ignoreCase="true" synonyms="synonyms.txt"/> <filter class="solr.SynonymGraphFilterFactory" expand="true" ignoreCase="true" synonyms="synonyms_2.txt"/> <filter class="solr.FlattenGraphFilterFactory"/> <filter class="solr.RemoveDuplicatesTokenFilterFactory"/> <filter class="solr.LowerCaseFilterFactory"/> </analyzer> <analyzer type="query"> <tokenizer class="solr.StandardTokenizerFactory"/> <filter class="solr.StopFilterFactory" words="stopwords.txt" ignoreCase="true"/> <filter class="solr.SynonymGraphFilterFactory" expand="true" ignoreCase="true" synonyms="synonyms.txt"/> <filter class="solr.SynonymGraphFilterFactory" expand="true" ignoreCase="true" synonyms="synonyms_2.txt"/> <filter class="solr.LowerCaseFilterFactory"/> </analyzer> </fieldType> This seems to return the expected result, as said earlier not sure if there are counter-indications. Best regards, Vincenzo On Wed, Oct 25, 2017 at 12:50 PM, Michael McCandless < luc...@mikemccandless.com> wrote: > You need only one FlattenGraphFilter at the end of your analysis chain. > > But note that neither SynonymGraphFilter nor SynonymFilter can consume a > graph as input; so multiple SynonymGraphFilters will not work. > > http://blog.mikemccandless.com/2012/04/lucenes- > tokenstreams-are-actually.html gives some insight into why synonym > filters create graphs, but it was written before SynonymGraphFilter and > FlattenGraphFilter. > > Mike McCandless > > http://blog.mikemccandless.com > > On Wed, Oct 25, 2017 at 5:04 AM, Vincenzo D'Amore <v.dam...@gmail.com> > wrote: > >> Hi all, >> >> I see in Solr SynonymFilterFactory is deprecated >> >> https://lucene.apache.org/core/7_1_0/analyzers-common/ >> org/apache/lucene/analysis/synonym/SynonymFilterFactory.html >> >> the documentation suggest: >> >> Use SynonymGraphFilterFactory >> > <https://lucene.apache.org/core/7_1_0/analyzers-common/org/ >> apache/lucene/analysis/synonym/SynonymGraphFilterFactory.html> >> > instead, but be sure to also use FlattenGraphFilterFactory >> > <https://lucene.apache.org/core/7_1_0/analyzers-common/org/ >> apache/lucene/analysis/core/FlattenGraphFilterFactory.html> >> > at index time (not at search time) as well. >> >> >> On the other hand documentation also say FlattenGraphFilterFactory is >> experimental and might change in incompatible ways in the next release. >> >> Not sure what to do in this case. Not clear what does >> FlattenGraphFilterFactory and why should I have it after the >> SynonymGraphFilterFactory. >> >> And again, if I have many SynonymGraphFilterFactory at index time, may I >> have only one FlattenGraphFilterFactory at end of chain or should I add a >> FlattenGraphFilterFactory for each SynonymGraphFilterFactory found in the >> chain? >> >> Thanks for your time and best regards, >> Vincenzo >> > >
