diff --git a/mmv1/products/firestore/Index.yaml b/mmv1/products/firestore/Index.yaml
index 1b9ec7323130..877cdca86cb3 100644
--- a/mmv1/products/firestore/Index.yaml
+++ b/mmv1/products/firestore/Index.yaml
@@ -16,6 +16,8 @@ name: 'Index'
 base_url: projects/{{project}}/databases/{{database}}/collectionGroups/{{collection}}/indexes
 self_link: '{{name}}'
 immutable: true
+error_retry_predicates:
+  ["transport_tpg.FirestoreIndex409CrossTransactionContetion"]
 description: |
   Cloud Firestore indexes enable simple and complex queries against documents in a database.
    This resource manages composite indexes and not single
diff --git a/mmv1/third_party/terraform/transport/error_retry_predicates.go b/mmv1/third_party/terraform/transport/error_retry_predicates.go
index d7c21e6fef94..c37cce72c484 100644
--- a/mmv1/third_party/terraform/transport/error_retry_predicates.go
+++ b/mmv1/third_party/terraform/transport/error_retry_predicates.go
@@ -330,6 +330,16 @@ func FirestoreField409RetryUnderlyingDataChanged(err error) (bool, string) {
 	return false, ""
 }
 
+// relevant for firestore in datastore mode
+func FirestoreIndex409CrossTransactionContetion(err error) (bool, string) {
+	if gerr, ok := err.(*googleapi.Error); ok {
+		if gerr.Code == 409 && strings.Contains(gerr.Body, "Aborted due to cross-transaction contention") {
+			return true, "aborted due to cross-transaction contention - retrying"
+		}
+	}
+	return false, ""
+}
+
 func IapClient409Operation(err error) (bool, string) {
 	if gerr, ok := err.(*googleapi.Error); ok {
 		if gerr.Code == 409 && strings.Contains(strings.ToLower(gerr.Body), "operation was aborted") {
diff --git a/mmv1/third_party/terraform/transport/error_retry_predicates_test.go b/mmv1/third_party/terraform/transport/error_retry_predicates_test.go
index a5f9b61e044a..317a7b0da9e9 100644
--- a/mmv1/third_party/terraform/transport/error_retry_predicates_test.go
+++ b/mmv1/third_party/terraform/transport/error_retry_predicates_test.go
@@ -181,3 +181,14 @@ func TestFirestoreField409_retryUnderlyingDataChanged(t *testing.T) {
 		t.Errorf("Error not detected as retryable")
 	}
 }
+
+func TestFirestoreIndex409_crossTransactionContetion(t *testing.T) {
+	err := googleapi.Error{
+		Code: 409,
+		Body: "Aborted due to cross-transaction contention",
+	}
+	isRetryable, _ := FirestoreIndex409CrossTransactionContetion(&err)
+	if !isRetryable {
+		t.Errorf("Error not detected as retryable")
+	}
+}