BZ1867056:Remove legacy forwarding from fluentd

Author: chinmayi-chandrasekar

modules/cluster-logging-collector-legacy-fluentd.adoc

@@ -41,7 +41,7 @@ To send logs using the Fluentd *forward* protocol, create a configuration file c
     flush_thread_count "2"
     retry_max_interval "300"
     retry_forever true
-    overflow_action "exception"
+    overflow_action "#{ENV['BUFFER_QUEUE_FULL_ACTION'] || 'throw_exception'}"
   </buffer>
   <server>
     host fluent-receiver.example.com