Set log level of "delaying recovery" message to DEBUG

Author: ywelsch

core/src/main/java/org/elasticsearch/indices/recovery/PeerRecoveryTargetService.java

@@ -427,7 +427,7 @@ public void messageReceived(final RecoveryTranslogOperationsRequest request, fin
                     // which causes local mapping changes since the mapping (clusterstate) might not have arrived on this node.
                     // we want to wait until these mappings are processed but also need to do some maintenance and roll back the
                     // number of processed (completed) operations in this batch to ensure accounting is correct.
-                    logger.trace("delaying recovery due to missing mapping changes", exception);
+                    logger.debug("delaying recovery due to missing mapping changes", exception);
                     // we do not need to use a timeout here since the entire recovery mechanism has an inactivity protection (it will be
                     // canceled)
                     observer.waitForNextChange(new ClusterStateObserver.Listener() {