Provide log4j2 logging config for microbenchmarks

benchmarks/src/main/resources/log4j.properties

@@ -1,8 +0,0 @@
-# Do not log at all if it is not really critical - we're in a benchmark
-benchmarks.es.logger.level=ERROR
-log4j.rootLogger=${benchmarks.es.logger.level}, out
-
-log4j.appender.out=org.apache.log4j.ConsoleAppender
-log4j.appender.out.layout=org.apache.log4j.PatternLayout
-log4j.appender.out.layout.conversionPattern=[%d{ISO8601}][%-5p][%-25c] %m%n
-

benchmarks/src/main/resources/log4j2.properties

@@ -0,0 +1,8 @@
+appender.console.type = Console
+appender.console.name = console
+appender.console.layout.type = PatternLayout
+appender.console.layout.pattern = [%d{ISO8601}][%-5p][%-25c] %marker%m%n
+
+# Do not log at all if it is not really critical - we're in a benchmark
+rootLogger.level = error
+rootLogger.appenderRef.console.ref = console