RUM: Remove vacuum analyze from migration

Can't be run in a trnasaction.

priv/repo/optional_migrations/rum_indexing/20190510135645_add_fts_index_to_objects_two.exs

@@ -20,7 +20,6 @@ def up do
     FOR EACH ROW EXECUTE PROCEDURE objects_fts_update()")
 
     execute("UPDATE objects SET updated_at = NOW()")
-    execute("vacuum analyze")
   end
 
   def down do
@@ -31,6 +30,5 @@ def down do
       remove(:fts_content, :tsvector)
     end
     create index(:objects, ["(to_tsvector('english', data->>'content'))"], using: :gin, name: :objects_fts)
-    execute("vacuum analyze")
   end
 end