Background fields are not ignored when comparing index spec equality

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      var coll = db.newColl;
coll.drop();

coll.ensureIndex({foo: 1}, {background: false});
coll.ensureIndex({foo: 1});
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      var coll = db.newColl; coll.drop(); coll.ensureIndex({foo: 1}, {background: false}); coll.ensureIndex({foo: 1});
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      If you have two index specs that are the same except for the presence of a 'background' field, ensureIndexes will no longer treat them as identical specs. This bug is a result of the changes from SERVER-10879.

      Error with master:

      > var coll = db.newColl;
> coll.drop();
true
> 
> coll.ensureIndex({foo: 1}, {background: false});
WriteResult({ "nInserted" : 1 })
> coll.ensureIndex({foo: 1});
WriteResult({
	"nInserted" : 0,
	"writeError" : {
		"code" : 67,
		"errmsg" : "Index with name: foo_1 already exists with different options"
	}
})

      No error with 2.4.9:

      > var coll = db.newColl;
> coll.drop();
true
> 
> coll.ensureIndex({foo: 1}, {background: false});
> coll.ensureIndex({foo: 1});
>

      Version: 914a26f51ff7ffeb28922273925318da6a6eba71

            Assignee:
            J Rassi (Inactive)
            Reporter:
            Kamran K. (Inactive)
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              Created:
              Updated:
              Resolved: