Intermittent scan timemout

Based on CI errors for TestDropOneIndexSecondDeferBuilding.

2015-05-18T21:17:53.688Z+05:30 [Debug] Indexer::handleMergeInitStream Bucket: default Stream: INIT_STREAM
2015-05-18T21:17:53.688Z+05:30 [Info] MutationMgr::handleUpdateIndexInstMap
Message: MsgUpdateInstMap
InstanceId: 9615363901081410018 Name: id_age Bucket: default State: INDEX_STATE_ACTIVE Stream: MAINT_STREAM
InstanceId: 1735997183546260465 Name: id_company Bucket: default State: INDEX_STATE_DELETED Stream: MAINT_STREAM
InstanceId: 16570113023127816862 Name: id_gender Bucket: default State: INDEX_STATE_ACTIVE Stream: MAINT_STREAM

2015-05-18T21:17:54.808Z+05:30 [Verbose] SCAN##88 REQUEST defnId:9615363901081410018, index:default/id_age, type:scan, span:range ([0.34e+2],[0.45e+2] incl:low), limit:10000000, consistency:session_consistency
...
2015-05-18T21:17:54.991Z+05:30 [Error] ScanCoordinator: Unable compute index count for default/id_isActive (Index not found)
2015-05-18T21:17:54.991Z+05:30 [Error] ScanCoordinator: Unable compute index count for default/id_age (Index not found)
2015-05-18T21:18:00.991Z+05:30 [Error] ScanCoordinator: Unable compute index count for default/id_isActive (Index not found)
2015-05-18T21:18:00.991Z+05:30 [Error] ScanCoordinator: Unable compute index count for default/id_age (Index not found)
2015-05-18T21:18:06.991Z+05:30 [Error] ScanCoordinator: Unable compute index count for default/id_isActive (Index not found)
2015-05-18T21:18:06.991Z+05:30 [Error] ScanCoordinator: Unable compute index count for default/id_age (Index not found)
2015-05-18T21:18:12.988Z+05:30 [Error] ScanCoordinator: Unable compute index count for default/id_age (Index not found)
2015-05-18T21:18:12.988Z+05:30 [Error] ScanCoordinator: Unable compute index count for default/id_isActive (Index not found)
2015-05-18T21:18:18.994Z+05:30 [Error] ScanCoordinator: Unable compute index count for default/id_isActive (Index not found)
2015-05-18T21:18:18.994Z+05:30 [Error] ScanCoordinator: Unable compute index count for default/id_age (Index not found)
2015-05-18T21:18:24.507Z+05:30 [Error] ScanCoordinator: Unable compute index count for default/id_age (Index not found)
2015-05-18T21:18:24.507Z+05:30 [Error] ScanCoordinator: Unable compute index count for default/id_isActive (Index not found)
2015-05-18T21:18:29.991Z+05:30 [Error] ScanCoordinator: Unable compute index count for default/id_isActive (Index not found)
2015-05-18T21:18:29.991Z+05:30 [Error] ScanCoordinator: Unable compute index count for default/id_age (Index not found)
2015-05-18T21:18:35.597Z+05:30 [Error] ScanCoordinator: Unable compute index count for default/id_isActive (Index not found)
2015-05-18T21:18:35.598Z+05:30 [Error] ScanCoordinator: Unable compute index count for default/id_age (Index not found)
2015-05-18T21:18:40.988Z+05:30 [Error] ScanCoordinator: Unable compute index count for default/id_age (Index not found)
2015-05-18T21:18:40.988Z+05:30 [Error] ScanCoordinator: Unable compute index count for default/id_isActive (Index not found)
2015-05-18T21:18:46.498Z+05:30 [Error] ScanCoordinator: Unable compute index count for default/id_isActive (Index not found)
2015-05-18T21:18:46.498Z+05:30 [Error] ScanCoordinator: Unable compute index count for default/id_age (Index not found)
2015-05-18T21:18:51.891Z+05:30 [Error] ScanCoordinator: Unable compute index count for default/id_age (Index not found)
2015-05-18T21:18:51.891Z+05:30 [Error] ScanCoordinator: Unable compute index count for default/id_isActive (Index not found)
2015-05-18T21:18:57.246Z+05:30 [Error] ScanCoordinator: Unable compute index count for default/id_isActive (Index not found)
2015-05-18T21:18:57.246Z+05:30 [Error] ScanCoordinator: Unable compute index count for default/id_age (Index not found)
2015-05-18T21:19:02.989Z+05:30 [Error] ScanCoordinator: Unable compute index count for default/id_age (Index not found)
2015-05-18T21:19:02.99Z+05:30 [Error] ScanCoordinator: Unable compute index count for default/id_isActive (Index not found)
2015-05-18T21:19:08.991Z+05:30 [Error] ScanCoordinator: Unable compute index count for default/id_isActive (Index not found)
2015-05-18T21:19:08.991Z+05:30 [Error] ScanCoordinator: Unable compute index count for default/id_age (Index not found)
2015-05-18T21:19:14.99Z+05:30 [Error] ScanCoordinator: Unable compute index count for default/id_age (Index not found)
2015-05-18T21:19:14.991Z+05:30 [Error] ScanCoordinator: Unable compute index count for default/id_isActive (Index not found)
2015-05-18T21:19:20.988Z+05:30 [Error] ScanCoordinator: Unable compute index count for default/id_isActive (Index not found)
2015-05-18T21:19:20.988Z+05:30 [Error] ScanCoordinator: Unable compute index count for default/id_age (Index not found)
2015-05-18T21:19:26.987Z+05:30 [Error] ScanCoordinator: Unable compute index count for default/id_age (Index not found)
2015-05-18T21:19:26.987Z+05:30 [Error] ScanCoordinator: Unable compute index count for default/id_isActive (Index not found)
2015-05-18T21:19:32.988Z+05:30 [Error] ScanCoordinator: Unable compute index count for default/id_age (Index not found)
2015-05-18T21:19:32.988Z+05:30 [Error] ScanCoordinator: Unable compute index count for default/id_isActive (Index not found)
2015-05-18T21:19:38.99Z+05:30 [Error] ScanCoordinator: Unable compute index count for default/id_isActive (Index not found)
2015-05-18T21:19:38.99Z+05:30 [Error] ScanCoordinator: Unable compute index count for default/id_age (Index not found)
2015-05-18T21:19:44.948Z+05:30 [Error] ScanCoordinator: Unable compute index count for default/id_isActive (Index not found)
2015-05-18T21:19:44.948Z+05:30 [Error] ScanCoordinator: Unable compute index count for default/id_age (Index not found)
2015-05-18T21:19:50.987Z+05:30 [Error] ScanCoordinator: Unable compute index count for default/id_age (Index not found)
2015-05-18T21:19:50.987Z+05:30 [Error] ScanCoordinator: Unable compute index count for default/id_isActive (Index not found)
2015-05-18T21:19:54.808Z+05:30 [Info] SCAN##88 RESPONSE status:(error = Index scan timed out)