Solr supports the following languages:
Solr supports documents in any language. If the document has a language (for example, Arabic) not listed above, it can still index the content, but stemming is not available. In this case, do not specify a language attribute in the cfindex tag.
Solr supports stemming. That is, it considers the root form (stem) of the word for search. This applies only if you provide the attribute language.