Pull in event.dataset if set (#40)

Author: basepi

ecs_logging/_stdlib.py

@@ -183,6 +183,7 @@ def format_to_ecs(self, record):
         extras["transaction.id"] = extras.pop("elasticapm_transaction_id", None)
         extras["trace.id"] = extras.pop("elasticapm_trace_id", None)
         extras["service.name"] = extras.pop("elasticapm_service_name", None)
+        extras["event.dataset"] = extras.pop("elasticapm_event_dataset", None)
 
         # Merge in any keys that were set within 'extra={...}'
         for field, value in extras.items():