Add change log

Author: WaVEV

docs/source/releases/5.2.x.rst

@@ -16,6 +16,12 @@ New features
 - Added :class:`~.fields.PolymorphicEmbeddedModelField` and
   :class:`~.fields.PolymorphicEmbeddedModelArrayField` for storing a model
   instance or list of model instances that may be of more than one model class.
+- Added support for MongoDB Atlas Search expressions, including
+  ``SearchAutocomplete``, ``SearchEquals``, ``SearchVector``, and others.
+- Added support for the ``search`` lookup on
+  :class:`~django.db.models.TextField` and
+  :class:`~django.db.models.CharField`.
+
 
 Backwards incompatible changes
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