facet.sh

#!/bin/sh
curl -XGET localhost:9200/drs/shows/_search -d '
{
    "query" : {
        "match_all" : {  }
    },
    "facets" : {
        "today_facet" : {
            "query" : {
                "term" : { "text" : "heute" }
            }
        }
    }
}

'

Well you're right - good discussion on stackoverflow - http://stackoverflow.com/questions/978061/http-get-with-request-body leading to http://tech.groups.yahoo.com/group/rest-discuss/message/9962

But's the way things are done with http://www.elasticsearch.com - see http://vimeo.com/9297470 at 6:48. And curl supports it... ;)