Fix a bug where deletions weren't updating the raw Kind index.

impl/memory/datastore_index.go

Index: impl/memory/datastore_index.go
diff --git a/impl/memory/datastore_index.go b/impl/memory/datastore_index.go
index db3a83c77a4852da0a0817da58e7e035123af04a..98b5267108e5c8a3ad7c102ea98026000b5718f5 100644
--- a/impl/memory/datastore_index.go
+++ b/impl/memory/datastore_index.go
@@ -45,7 +45,10 @@ func defaultIndexes(kind string, pmap ds.PropertyMap) []*ds.IndexDefinition {
 }
 
 func indexEntriesWithBuiltins(k *ds.Key, pm ds.PropertyMap, complexIdxs []*ds.IndexDefinition) memStore {
-	sip := serialize.PropertyMapPartially(k, pm)
+	var sip serialize.SerializedPmap
+	if pm != nil {
+		sip = serialize.PropertyMapPartially(k, pm)
+	}
 	return indexEntries(sip, k.Namespace(), append(defaultIndexes(k.Kind(), pm), complexIdxs...))
 }
 
@@ -258,7 +261,7 @@ func addIndexes(store memStore, aid string, compIdx []*ds.IndexDefinition) {
 
 func updateIndexes(store memStore, key *ds.Key, oldEnt, newEnt ds.PropertyMap) {

[iannucci, 2016/11/12 00:05:47]

add comment mentioning that nil has special meaning vs just an empty property
map.

 	// load all current complex query index definitions.
-	compIdx := []*ds.IndexDefinition{}
+	var compIdx []*ds.IndexDefinition
 	walkCompIdxs(store.Snapshot(), nil, func(i *ds.IndexDefinition) bool {
 		compIdx = append(compIdx, i)
 		return true