> db.fb_posts.getIndexes()
[
	{
		"name" : "_id_",
		"ns" : "bigdash.fb_posts",
		"key" : {
			"_id" : 1
		},
		"v" : 0
	},
	{
		"v" : 1,
		"key" : {
			"objid" : 1
		},
		"ns" : "bigdash.fb_posts",
		"name" : "objid_1"
	},
	{
		"v" : 1,
		"key" : {
			"date" : 1
		},
		"ns" : "bigdash.fb_posts",
		"name" : "date_1"
	}
]
> db.fb_posts.find({objid:'103632155147'})
error: { "$err" : "assertion db/key.cpp:409" }
> db.fb_posts.find({objid:'103632155147'})[0]
Wed Sep 28 14:01:24   Assertion failure JS_CallFunctionName( cx , obj , "arrayAccess" , 1 , &id , &val ) scripting/sm_db.cpp 1089
0x10007a4a3 0x10007bc9c 0x1000f4266 0x100164468 0x1001652b8 0x1001550b3 0x10015b429 0x100110e1b 0x100106469 0x10000918f 0x10000af3a 0x1000019c4 
 0   mongo                               0x000000010007a4a3 _ZN5mongo12sayDbContextEPKc + 195
 1   mongo                               0x000000010007bc9c _ZN5mongo8assertedEPKcS1_j + 300
 2   mongo                               0x00000001000f4266 _ZN5mongo15dbquery_resolveEP9JSContextP8JSObjectljPS3_ + 246
 3   mongo                               0x0000000100164468 js_LookupPropertyWithFlags + 472
 4   mongo                               0x00000001001652b8 js_GetProperty + 120
 5   mongo                               0x00000001001550b3 js_Interpret + 39907
 6   mongo                               0x000000010015b429 js_Execute + 409
 7   mongo                               0x0000000100110e1b JS_EvaluateScript + 219
 8   mongo                               0x0000000100106469 _ZN5mongo7SMScope4execERKNS_10StringDataERKSsbbbi + 473
 9   mongo                               0x000000010000918f _Z5_mainiPPc + 6367
 10  mongo                               0x000000010000af3a main + 42
 11  mongo                               0x00000001000019c4 start + 52
error:assertion scripting/sm_db.cpp:1089
> db.fb_posts.find({objid:'103632155147'}).count()
Wed Sep 28 14:01:27 mongo got signal 11 (Segmentation fault), stack trace: 

Wed Sep 28 14:01:27 0x10000279c 0x7fff86b351ba 0 0x10010aa75 0x100110de0 0x100106469 0x1000096ab 0x10000af3a 0x1000019c4 
 0   mongo                               0x000000010000279c _Z12quitAbruptlyi + 316
 1   libSystem.B.dylib                   0x00007fff86b351ba _sigtramp + 26
 2   ???                                 0x0000000000000000 0x0 + 0
 3   mongo                               0x000000010010aa75 CompileTokenStream + 325
 4   mongo                               0x0000000100110de0 JS_EvaluateScript + 160
 5   mongo                               0x0000000100106469 _ZN5mongo7SMScope4execERKNS_10StringDataERKSsbbbi + 473
 6   mongo                               0x00000001000096ab _Z5_mainiPPc + 7675
 7   mongo                               0x000000010000af3a main + 42
 8   mongo                               0x00000001000019c4 start + 52

> db.fb_posts.reIndex()
{
	"nIndexesWas" : 3,
	"msg" : "indexes dropped for collection",
	"nIndexes" : 3,
	"indexes" : [
		{
			"name" : "_id_",
			"ns" : "bigdash.fb_posts",
			"key" : {
				"_id" : 1
			}
		},
		{
			"key" : {
				"objid" : 1
			},
			"ns" : "bigdash.fb_posts",
			"name" : "objid_1"
		},
		{
			"key" : {
				"date" : 1
			},
			"ns" : "bigdash.fb_posts",
			"name" : "date_1"
		}
	],
	"ok" : 1
}

> // Now the old queries work.