Check for connection errors during event transit in elasticsearch and webhook (#8273)

pkg/event/target/elasticsearch.go

@@ -171,6 +171,9 @@ func (target *ElasticsearchTarget) Send(eventKey string) error {
 	}
 
 	if err := target.send(eventData); err != nil {
+		if xnet.IsNetworkOrHostDown(err) {
+			return errNotConnected
+		}
 		return err
 	}
 

pkg/event/target/webhook.go

@@ -155,6 +155,9 @@ func (target *WebhookTarget) Send(eventKey string) error {
 	}
 
 	if err := target.send(eventData); err != nil {
+		if xnet.IsNetworkOrHostDown(err) {
+			return errNotConnected
+		}
 		return err
 	}