Add error to reserved log keys.

Author: phipag

powertools-logging/powertools-logging-log4j/src/main/java/org/apache/logging/log4j/layout/template/json/resolver/PowertoolsResolver.java

@@ -48,7 +48,8 @@
  */
 final class PowertoolsResolver implements EventResolver {
     private static final Set<String> RESERVED_LOG_KEYS = Stream
-            .concat(PowertoolsLoggedFields.stringValues().stream(), List.of("message", "level", "timestamp").stream())
+            .concat(PowertoolsLoggedFields.stringValues().stream(),
+                    List.of("message", "level", "timestamp", "error").stream())
             .collect(Collectors.toSet());
 
     private static final EventResolver COLD_START_RESOLVER = new EventResolver() {

powertools-logging/powertools-logging-logback/src/main/java/software/amazon/lambda/powertools/logging/logback/JsonUtils.java

@@ -36,7 +36,8 @@
  */
 final class JsonUtils {
     private static final Set<String> RESERVED_LOG_KEYS = Stream
-            .concat(PowertoolsLoggedFields.stringValues().stream(), List.of("message", "level", "timestamp").stream())
+            .concat(PowertoolsLoggedFields.stringValues().stream(),
+                    List.of("message", "level", "timestamp", "error").stream())
             .collect(Collectors.toSet());
 
     private JsonUtils() {