[SERVER-25164] $rename doesn't rename fields with dots (.) - MongoDB

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`$rename` cannot rename fields with dots (.) in their names:

A collections like:

> db.test.find()

{ "_id" : ObjectId("578ec46e39b3c19fbbeb2264"), "a.b" : 1 }

{ "_id" : ObjectId("578ec46e39b3c19fbbeb2262"), "a.b" : 2 }

won't get updated with:

> db.test.update({}, { $rename : { "a.b" : "ab" }}, false, true);

WriteResult({ "nMatched" : 2, "nUpserted" : 0, "nModified" : 0 })

> db.test.find()

{ "_id" : ObjectId("578ec46e39b3c19fbbeb2264"), "a.b" : 1 }

{ "_id" : ObjectId("578ec46e39b3c19fbbeb2262"), "a.b" : 2 }

related to

SERVER-15029 $rename modifier uses incorrect dotted source path

SERVER-20171 Invalid "cannot use the part to traverse the element"

TOOLS-1335 mongoimport imports fields with dots (.) from JSON