DOCSP-9534-update: change search operator to text (#152)

Author: steveren

source/includes/steps-fts-sample-app.yaml

@@ -88,7 +88,7 @@ content: |
       .. code-block:: none
 
         {
-          search: {
+          text: {
             query: 'vampires and werewolves',
             path: 'fullplot'
           },
@@ -193,7 +193,7 @@ content: |
           return collection.aggregate([
           	  { 
                 $search: {
-                  search: {
+                  text: {
                      query: arg,
                      path:'fullplot',
                    },