Use consistent default topic

Signed-off-by: Davit Yeghshatyan <davo@uber.com>

Author: Davit Yeghshatyan

cmd/ingester/app/options.go

@@ -38,7 +38,7 @@ const (
 	encodingProto = "protobuf"
 
 	defaultBroker      = "127.0.0.1:9092"
-	defaultTopic       = "jaeger-ingester-spans"
+	defaultTopic       = "jaeger-spans"
 	defaultGroupID     = "jaeger-ingester"
 	defaultParallelism = 1000
 	defaultEncoding    = encodingProto