Added comments.

Change-Id: I43518c832661499fa28426235efc96da091929bb
diff --git a/src/main/resources/log4j.properties b/src/main/resources/log4j.properties
index 1554002..2805e78 100644
--- a/src/main/resources/log4j.properties
+++ b/src/main/resources/log4j.properties
@@ -1,4 +1,4 @@
-log4j.rootLogger = DEBUG, stdout
+log4j.rootLogger = ERROR, stdout
 
 # Queries:
 # log4j.logger.de.ids_mannheim.korap.query.SpanNextQuery = TRACE, stdout