Cause: The incoming data has a field `record["event"]` that is a String value and not the Hash value expected by the transform_eventrouter code. Consequence: This causes the code to throw an error and fluentd to emit an error like this: ``` error_class=NoMethodError error="undefined method `key?' for \"request\":String" ``` Fix: The transform_eventrouter code has been changed to only process the `record["event"]` field if it is a Hash. Result: Records can flow through to Elasticsearch again.