DOCSP-14880 Create shell page for Atlas Search

DOCSP-14880 updates for copy review feedback

Author: kanchana-mongodb

source/includes/extracts-agg-stages.yaml

@@ -165,6 +165,17 @@ content: |
         - Randomly selects the specified number of documents from its
           input.
 
+      * - :pipeline:`$search`
+
+        - Performs a full-text search of the field or fields in an 
+          :atlas:`Atlas </reference/atlas-search/query-syntax/>` 
+          collection.
+
+          .. note:: 
+
+             ``$search`` is only available for MongoDB Atlas clusters, 
+             and is not available for self-managed deployments.
+
       * - :pipeline:`$set`
 
         - Adds new fields to documents. Similar to

source/reference/operator/aggregation-pipeline.txt

@@ -242,6 +242,17 @@ Alphabetical Listing of Stages
      - Randomly selects the specified number of documents from its input.
 
 
+   * - :doc:`$search </reference/operator/aggregation/search>`
+
+     - Performs a full-text search of the field or fields in an Atlas 
+       collection.
+
+       .. note:: 
+
+          ``$search`` is only available for MongoDB Atlas clusters, and 
+          is not available for self-managed deployments.
+
+
    * - :pipeline:`$set`
 
      - Adds new fields to documents. Outputs documents that
@@ -320,6 +331,7 @@ Alphabetical Listing of Stages
    /reference/operator/aggregation/replaceRoot
    /reference/operator/aggregation/replaceWith
    /reference/operator/aggregation/sample
+   /reference/operator/aggregation/search
    /reference/operator/aggregation/set
    /reference/operator/aggregation/skip
    /reference/operator/aggregation/sort

source/reference/operator/aggregation/search.txt

@@ -0,0 +1,26 @@
+=====================
+$search (aggregation)
+=====================
+
+.. default-domain:: mongodb
+
+``$search`` aggregation pipleline stage performs a full-text search of 
+the field or fields in an Atlas collection. The fields must be covered 
+by an :atlas:`Atlas Search 
+</reference/atlas-search/index-definitions/>` index. See:
+
+- :atlas:`Atlas Search Index 
+  </reference/atlas-search/index-definitions/>` to learn more about 
+  creating and managing Atlas Search indexes.
+- :atlas:`$search Aggregation Pipeline Stage` to learn more about the 
+  ``$search`` pipeline stage syntax and usage.
+- :atlas:`$search Operators </reference/atlas-search/operators/>` to 
+  learn more about the ``$search`` aggregation pipeline stage 
+  operators.
+
+.. important:: 
+
+   The ``$search`` aggregation pipeline stage is only available for 
+   collections hosted on :atlas:`MongoDB Atlas </>` cluster tiers 
+   running MongoDB version 4.2 or later. To learn more, see 
+   :atlas:`Atlas Search </atlas-search/>`.