Simplify confusing warning message when index key generation for 2dsphere indices generates a large number of keys

2015-05-13T16:13:51.178-0400 W INDEX    [conn1] insert of geo object generated lots of keys (300) consider creating larger buckets. obj={ _id: ObjectId('5553b07f03d305416fb48b3e'), a: [ 1.0, 2.0, 3.0, 4.0, 5.0 ], b: [ 1.0, 2.0, 3.0, 4.0, 5.0 ], c: [ 1.0, 2.0, 3.0 ], d: [ 1.0, 2.0, 3.0, 4.0 ], e: 1.0, f: { type: "Point", coordinates: [ 0.0, 0.0 ] } }