add whats new entry

Author: rustagir

source/whats-new.txt

@@ -38,13 +38,13 @@ What's New in 2.0
    changes:
 
    - The following methods return ``void`` instead of the raw command
-     response:
+	 response:
 
-     - ``MongoDB\Client``: ``dropDatabase()``
-     - ``MongoDB\Collection``: ``drop()``, ``dropIndex()``,
-       ``dropIndexes()``, ``dropSearchIndex()``, ``rename()``
-     - ``MongoDB\Database``: ``createCollection()``, ``drop()``,
-       ``dropCollection()``, ``renameCollection()``
+	 - ``MongoDB\Client``: ``dropDatabase()``
+	 - ``MongoDB\Collection``: ``drop()``, ``dropIndex()``,
+	   ``dropIndexes()``, ``dropSearchIndex()``, ``rename()``
+	 - ``MongoDB\Database``: ``createCollection()``, ``drop()``,
+	   ``dropCollection()``, ``renameCollection()``
 
    To learn more about breaking changes in this release, see the
    :ref:`Version 2.0 Breaking Changes <php-v2-breaking-changes>` section
@@ -67,14 +67,14 @@ and removals:
 - Removes deprecated fields in GridFS types.
 
   - The library does not calculate the ``md5`` field when a file is
-    uploaded to GridFS. If your application requires a file digest, you
-    must implement this process outside GridFS and store the values in
-    metadata.
+	uploaded to GridFS. If your application requires a file digest, you
+	must implement this process outside GridFS and store the values in
+	metadata.
 
   - The fields ``contentType`` and ``aliases`` are no longer stored in
-    the ``files`` GridFS collection. If your application requires this
-    information, you must store it in metadata. To learn more about
-    GridFS, see the :ref:`php-gridfs` guide.
+	the ``files`` GridFS collection. If your application requires this
+	information, you must store it in metadata. To learn more about
+	GridFS, see the :ref:`php-gridfs` guide.
 
 - Removes the following deprecated options for find operations:
 
@@ -164,6 +164,13 @@ improvements, and fixes:
   encryption and decryption of the data key locally, ensuring that the
   encryption key never leaves the KMIP server.
 
+- Adds the ``type`` option in Search index specifications for
+  the :phpmethod:`MongoDB\Collection::createIndex()` and
+  :phpmethod:`MongoDB\Collection::createSearchIndexes()` methods. This
+  change allows you to create Atlas Vector Search indexes
+  programmatically. To learn more and view examples, see the
+  :ref:`php-atlas-search-index` guide.
+
 For more information about the changes in this version, see the
 :github:`v1.20 release notes
 </mongodb/mongo-php-library/releases/tag/1.20.0>` on GitHub.