Projecting {$meta: textScore} does not work in findAndModify

db.test.findAndModify({

    query: { $text: { $search: "dog" } },

    update: { $inc: { count :1} },

    fields: { score: { $meta: "textScore" } }

})

2014-01-20T19:29:36.927-0500 findAndModifyFailed failed: {

  "errmsg": "exception: Unsupported projection option: $meta",

  "code": 13097,

  "ok": 0

} at src/mongo/shell/collection.js:504