fix(datastore): fix NoIndex for array property (#7674)

* fix(datastore): fix NoIndex for array property
When converting proto to Entity with array property, excludeFromIndexes appears in the values level, not the top level.

* fix test

---------

Co-authored-by: meredithslota <meredithslota@google.com>
Co-authored-by: Baha Aiman <bahaaiman@google.com>

datastore/load.go

@@ -507,10 +507,16 @@ func protoToEntity(src *pb.Entity) (*Entity, error) {
 		if err != nil {
 			return nil, err
 		}
+		noIndex := val.ExcludeFromIndexes
+		if array := val.GetArrayValue(); array != nil {
+			if values := array.GetValues(); len(values) > 0 {
+				noIndex = values[0].ExcludeFromIndexes
+			}
+		}
 		props = append(props, Property{
 			Name:    name,
 			Value:   v,
-			NoIndex: val.ExcludeFromIndexes,
+			NoIndex: noIndex,
 		})
 	}
 	var key *Key

datastore/load_test.go

@@ -23,6 +23,7 @@ import (
 
 	"cloud.google.com/go/civil"
 	"cloud.google.com/go/internal/testutil"
+	"github.com/google/go-cmp/cmp/cmpopts"
 	pb "google.golang.org/genproto/googleapis/datastore/v1"
 	"google.golang.org/protobuf/types/known/timestamppb"
 )
@@ -602,6 +603,68 @@ func TestTimezone(t *testing.T) {
 	}
 }
 
+func TestLoadArrayIndex(t *testing.T) {
+	src := &pb.Entity{
+		Key: keyToProto(testKey0),
+		Properties: map[string]*pb.Value{
+			"indexed": {
+				ValueType: &pb.Value_ArrayValue{
+					ArrayValue: &pb.ArrayValue{
+						Values: []*pb.Value{
+							{
+								ValueType:          &pb.Value_StringValue{StringValue: "1"},
+								ExcludeFromIndexes: false,
+							},
+							{
+								ValueType:          &pb.Value_StringValue{StringValue: "2"},
+								ExcludeFromIndexes: false,
+							},
+						},
+					},
+				},
+			},
+			"non-indexed": {
+				ValueType: &pb.Value_ArrayValue{
+					ArrayValue: &pb.ArrayValue{
+						Values: []*pb.Value{
+							{
+								ValueType:          &pb.Value_StringValue{StringValue: "3"},
+								ExcludeFromIndexes: true,
+							},
+							{
+								ValueType:          &pb.Value_StringValue{StringValue: "4"},
+								ExcludeFromIndexes: true,
+							},
+						},
+					},
+				},
+			},
+		},
+	}
+	want := &Entity{
+		Key: testKey0,
+		Properties: []Property{
+			{Name: "indexed", Value: []interface{}{"1", "2"}, NoIndex: false},
+			{Name: "non-indexed", Value: []interface{}{"3", "4"}, NoIndex: true},
+		},
+	}
+
+	dst, err := protoToEntity(src)
+	if err != nil {
+		t.Fatalf("protoToEntity: %v", err)
+	}
+
+	cmpProperties := func(p1, p2 Property) bool {
+		return p1.Name < p2.Name
+	}
+	if !testutil.Equal(want.Properties, dst.Properties, cmpopts.SortSlices(cmpProperties)) {
+		t.Errorf("NoIndex should be correct: Property:\ngot:  %#v\nwant: %#v", dst, want)
+	}
+	if !testutil.Equal(want.Key, dst.Key) {
+		t.Errorf("NoIndex should be correct: Key:\ngot:  %#v\nwant: %#v", dst, want)
+	}
+}
+
 func TestAlreadyPopulatedDst(t *testing.T) {
 	testCases := []struct {
 		desc string