[SERVER-12474] mongos gle no longer returns updatedExisting in 2.5.4 nightly - MongoDB Jira

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Although we're moving to write commands there are likely applications in the wild relying on this.

MongoDB 2.4.9:

mongos> db.test.insert({i: 1})

mongos> db.test.update({i: 1}, {$set: {i: 1}})

mongos> db.runCommand('getLastError')

	"singleShard" : "localhost:30000",

	"updatedExisting" : true,

	"n" : 1,

	"connectionId" : 2,

	"err" : null,

	"ok" : 1

MongoDB 2.5.4 nightly:

mongos> db.test.insert({i: 1})

...

mongos> db.test.update({i: 1}, {$set: {i: 1}})

...

"nUpdated" : 1,

...

mongos> db.runCommand('getLastError')

	"n" : 0,

	"shards" : [ ],

	"shardRawGLE" : {

},

	"err" : null,

	"ok" : 1

duplicates

SERVER-12419 mongos GLE does not work correctly if previous write was from a command

is related to

SERVER-12329 UpdatedExisting always true after update command

related to

SERVER-12404 err field can appear twice in getLastError response

SERVER-12274 Fail-fast on invalid WriteConcern options in write commands