+// CFG: INDEX-PRE-ALLOCATE-ENABLED
+$cfg->setConfigEntry('index_pre_allocate_enabled', 'Y');
+
+// CFG: INDEX-PRE-ALLOCATE-COUNT
+$cfg->setConfigEntry('index_pre_allocate_count', 10000);
+
+// CFG: STACK-FILE-CLASS
+$cfg->setConfigEntry('stack_file_class', 'StackFile');
+
+// CFG: INDEX-FILE-CLASS
+$cfg->setConfigEntry('index_file_class', 'IndexFile');
+