Add Changelog

Author: schmidt-sebastian

packages/firestore/CHANGELOG.md

@@ -1,11 +1,21 @@
 # Unreleased
+- [changed] All known failure cases for Indexed-related crashes have now been
+  addressed. Instead of crashing the client, IndexedDB failures will result
+  in rejected operations (e.g. rejected Writes or errored Query listeners). 
+  If these rejections surface in your app, you can retry these operations 
+  when IndexedDB access is restored. 
+  IndexedDB failures that occur due to background work are automatically 
+  retried. 
+  
+  If you continue to see Indexed-related crashes, we appreciate feedback 
+  (https://github.com/firebase/firebase-js-sdk/issues/2755).
+
+# Released
 - [fixed] Fixed an issue that could cause Firestore to temporarily go 
   offline when a Window visibility event occurred.
 - [feature] Added support for calling  `FirebaseFiresore.settings` with 
   `{ ignoreUndefinedProperties: true }`. When set, Firestore ignores 
   undefined properties inside objects rather than rejecting the API call.
-
-# Released
 - [fixed] Fixed a regression introduced in v7.14.2 that incorrectly applied
   a `FieldValue.increment` in combination with `set({...}, {merge: true})`.
 - [fixed] Firestore now rejects `onSnapshot()` listeners if they cannot be