Fix another race.

impl/memory/datastore_data.go

Index: impl/memory/datastore_data.go
diff --git a/impl/memory/datastore_data.go b/impl/memory/datastore_data.go
index b5a40819286012a7f4b653c1e5b063e3eb33c776..dbb49783b1083ef574d3ff0139ceab64dc373d10 100644
--- a/impl/memory/datastore_data.go
+++ b/impl/memory/datastore_data.go
@@ -277,8 +277,8 @@ func (d *dataStoreData) putMulti(keys []*ds.Key, vals []ds.PropertyMap, cb ds.Pu
 					return
 				}
 			}
-			updateIndexes(d.head, ret, oldPM, pmap)
 			ents.Set(keyBytes(ret), dataBytes)
+			updateIndexes(d.head, ret, oldPM, pmap)
 			return
 		}()
 		if cb != nil {
@@ -345,8 +345,8 @@ func (d *dataStoreData) delMulti(keys []*ds.Key, cb ds.DeleteMultiCB) {
 					if err != nil {
 						return err
 					}
-					updateIndexes(d.head, k, oldPM, nil)
 					ents.Delete(kb)
+					updateIndexes(d.head, k, oldPM, nil)
 				}
 				return nil
 			}()