SERVER-12911 make ensureIndex return value consistent

1 files changed, 2 insertions, 4 deletions

diff --git a/src/mongo/shell/collection.js b/src/mongo/shell/collection.js
index f57443ee85e..32ed762a8a8 100644
--- a/src/mongo/shell/collection.js
+++ b/src/mongo/shell/collection.js
@@ -506,10 +506,8 @@ DBCollection.prototype.createIndex = function( keys , options ){
 DBCollection.prototype.ensureIndex = function( keys , options ){
     var result = this.createIndex(keys, options);
 
-    if (result != null) {
-        if (!result.ok) return result;
-        // Preserve old behavior of returning undefined on success.
-        return;
+    if ( this._mongo.useWriteCommands() ) {
+        return result;
     }
 
     err = this.getDB().getLastErrorObj();