IGNITE-15310 fix bug in JavaLoggerFormatter (#281)

diff --git a/modules/core/src/main/java/org/apache/ignite/lang/JavaLoggerFormatter.java b/modules/core/src/main/java/org/apache/ignite/lang/JavaLoggerFormatter.java
index ffd2c9b..9f5ee41 100644
--- a/modules/core/src/main/java/org/apache/ignite/lang/JavaLoggerFormatter.java
+++ b/modules/core/src/main/java/org/apache/ignite/lang/JavaLoggerFormatter.java
@@ -141,6 +141,6 @@
         // for level > SEVERE, return SEVERE and exclude OFF
         int i = Arrays.binarySearch(LEVEL_VALUES, 0, LEVEL_VALUES.length - 2, severity);
 
-        return toLevel(i);
+        return toLevel(LEVEL_VALUES[i >= 0 ? i : (-i - 1)]);
     }
 }