Change algorithm of follow recommendations (#28314)

Co-authored-by: Claire <claire.github-309c@sitedethib.com>

app/services/account_search_service.rb

@@ -23,6 +23,7 @@ class AccountSearchService < BaseService
               query: {
                 bool: {
                   must: must_clauses,
+                  must_not: must_not_clauses,
                 },
               },
 
@@ -49,6 +50,10 @@ class AccountSearchService < BaseService
       end
     end
 
+    def must_not_clauses
+      []
+    end
+
     def should_clauses
       if @account && !@options[:following]
         [boost_following_query]