rr and jm feedback

Author: shuangela

source/includes/extracts-watch-option.yaml

@@ -1,10 +1,15 @@
 ref: watch-option-batchSize
 content: |
-  The maximum number of documents within each batch returned in a query result, which applies 
+  The maximum number of documents within each batch returned in a change stream, which applies 
   to the ``aggregate`` command. By default, the ``aggregate`` command has an initial batch size of 
   ``101`` documents and a maximum size of 16 mebibytes (MiB) for each subsequent batch. This
   option can enforce a smaller limit than 16 MiB, but not a larger one. If you set ``batchSize`` 
   to a limit that results in batches larger than 16 MiB, this option has no effect.
+
+  Irrespective of the ``batchSize`` option, the initial ``aggregate`` command
+  response for a change stream generally does not include any documents
+  unless another option is used to configure its starting point (e.g.
+  ``startAfter``).
 ---
 ref: watch-option-fullDocument
 content: |

source/reference/method/MongoDBCollection-find.txt

@@ -52,15 +52,14 @@ Parameters
 
      * - batchSize
        - integer
-       - The maximum number of documents to return in the first batch. By default, the ``find()`` 
-         command has an initial batch size of ``101`` documents. This
-         option can enforce a smaller limit than 16 mebibytes (MiB), but not a larger
+       - The maximum number of documents within each batch returned in a query result. By default, the ``find`` 
+         command has an initial batch size of ``101`` documents and a maximum size of 16 mebibytes (MiB)
+         for each subsequent batch. This option can enforce a smaller limit than 16 mebibytes (MiB), but not a larger
          one. If you set ``batchSize`` to a limit that results in batches larger than
          16 MiB, this option has no effect.
 
          A batchSize of ``0`` means that the cursor will be established, but no documents 
-         will be returned in the first batch. This may be useful for quickly returning a cursor
-         or failure without doing significant server-side work.
+         will be returned in the first batch.
 
          Unlike the previous wire protocol version, a batchSize of ``1`` for the
          :dbcommand:`find` command does not close the cursor.

source/reference/method/MongoDBCollection-listSearchIndexes.txt

@@ -47,10 +47,6 @@ Parameters
          one. If you set ``batchSize`` to a limit that results in batches larger than
          16 MiB, this option has no effect.
 
-         A batchSize of ``0`` means that the cursor will be established, but no documents 
-         will be returned in the first batch. This may be useful for quickly returning a cursor
-         or failure from ``aggregate`` without doing significant server-side work.
-
      * - codec
        - MongoDB\\Codec\\DocumentCodec
        - .. include:: /includes/extracts/collection-option-codec.rst