fix(specs): responseFields description (#4399)

Author: kai687

specs/common/schemas/IndexSettings.yml

@@ -671,16 +671,20 @@ indexSettingsAsSearchParams:
       items:
         type: string
       description: |
-        Properties to include in the API response of `search` and `browse` requests.
+        Properties to include in the API response of search and browse requests.
 
         By default, all response properties are included.
-        To reduce the response size, you can select, which attributes should be included.
+        To reduce the response size, you can select which properties should be included.
+
+        An empty list may lead to an empty API response (except properties you can't exclude).
 
         You can't exclude these properties:
-        `message`, `warning`, `cursor`, `serverUsed`, `indexUsed`,
-        `abTestVariantID`, `parsedQuery`, or any property triggered by the `getRankingInfo` parameter.
+        `message`, `warning`, `cursor`, `abTestVariantID`,
+        or any property added by setting `getRankingInfo` to true.
 
-        Don't exclude properties that you might need in your search UI.
+        Your search depends on the `hits` field. If you omit this field, searches won't return any results.
+        Your UI might also depend on other properties, for example, for pagination.
+        Before restricting the response size, check the impact on your search experience.
       default: ['*']
       x-categories:
         - Advanced