[API] Add missing param in cat/thread_pool

Author: estolfo

elasticsearch-api/lib/elasticsearch/api/actions/cat/thread_pool.rb

@@ -76,7 +76,8 @@ def thread_pool(arguments={})
             :h,
             :help,
             :s,
-            :v ].freeze)
+            :v,
+            :thread_pool_patterns].freeze)
       end
     end
   end