Minor - P4 When hinting on a non-existent index, the new query framework error message is difficult to parse and needs at least punctuation between the message and the query details. Ideally it would tell the reason as in 2.4
In 2.4.8
> db.c.find( {} ).hint({b:1})
error: { "$err" : "bad hint", "code" : 10113 }
In 2.5.5-pre:
> db.c.find( {} ).hint({b:1})
error: {
"$err" : "Couldn't get runner for query because: No query solutions query is ns=luke.c limit=0 skip=0\nTree: $and\nSort: {}\nProj: {}\n",
"code" : 17007
}