Kentico 13 Smart Search not working with Local Indexes

We are implementing Smart Search in Kentico 13. In our initial we had enabled the search feature, followed by adding local indexes (I added a local index with name "DefaultSearchIndex"). For the indexes we have set the path to a page with sub pages so that search results are considered from sub pages. After doing the configuration when I search from the admin panel under Local Indexes>DefaultSearchIndex>Search preview, I get the correct result.

Now, the issue I am facing is that I want to use the same index at controller end to return a custom view. Here I used the code provided in documentation also shown below

 //Prepares variables required to perform the search operation
            IEnumerable<string> searchIndexes = new List<string> { "DefaultSearchIndex" };

            int pageNumber = 1;
            int pageSize = 1000;
            UserInfo searchUser = MembershipContext.AuthenticatedUser;
            string cultureCode = "en-us";
            /* Indicates whether the search service uses site default language version of pages as a replacement
            for pages that are not translated into the language specified by 'cultureCode' */
            bool combineWithDefaultCulture = true;

            // Prepares a 'SearchParameters' object to search through indexes of the 'Pages' type
            SearchParameters searchParameters = SearchParameters.PrepareForPages(searchQuery, searchIndexes, pageNumber, pageSize, searchUser, cultureCode, combineWithDefaultCulture);



            // Searches the specified indexes
            SearchResult searchResult = SearchHelper.Search(searchParameters);

You can see that I have added the index but when I call this API, this is not returning any results using the index name of the local index.

Secondly, when I rename the Local Index to "Search", this returns the results but for all the nodes, that is it is not considering the selected path in the Indexed content.