Dear list, just in case you are planning to integrate or combine a thesaurus with Solr the following report might help you.
BASE - Solr and the multilingual EuroVoc Thesaurus http://www.ub.uni-bielefeld.de/~befehl/base/solr/eurovoc.html In brief: It explains how a working solution is possible to integrate/combine the multilingual EuroVoc Thesaurus with Solr. It is used as query time search term expansion. Covering over 22 languages this gives you the ability to also find documents in other languages than the original query and also expand the query with synonyms. Best regards Bernd