this works against mongodb 2.7:

> db.runCommand({ listCollections : 1, filter : { name : "dbclient" } })
{
	"collections" : [
		{
			"name" : "dbclient",
			"options" : {

			}
		}
	],
	"ok" : 1
}

But the fallback code in the driver when running against a <2.7 server which does not offer the listCollections command attempts to query system.indexes with the same filter:

> db.system.namespaces.find({name : "dbclient"}) 

That doesn't match, because in system.namespaces the names are db qualified:

> db.system.namespaces.find({name : "test.dbclient"})
{ "name" : "test.dbclient" }

So the fallback code will need to make a new BSONObj that db qualifies any 'name' element in the filter.

Marking this ticket "driver changes needed" since fix will need to be backported to the legacy C++ driver.