Solr field collapsing

I read http://wiki.apache.org/solr/FieldCollapsing

and I tried the query http://192.168.0.1:8080/solr/append/select?q=mobile&group=true&group.field=brand

and I don't see the field collapsing. I mean I see the results, but not the grouping. My understanding is it should work, nothing to change in the solrconfig.xml ? In my schema, all my field are stored/index. My index is Lucene 2.9 and my Solr is 1开发者_如何学编程.4.1. I don't see what I doing wrong...

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Field collapsing is not available in Solr 1.4.1. You need Solr 3.3 or 4.0 (currently unreleased).

The wiki page about field collapsing also explains "If you haven't already, get a recent nightly build of Solr4.0 or Solr3.3..."

Look for "warning tags" in the Solr wiki that show when a particular feature is available only since a particular version of Solr: