Map logger name to log.logger instead of event.dataset

README.md

@@ -15,9 +15,9 @@ This library helps to log ECS-compatible JSON into a file
 
 Example:
 ```
-{"@timestamp":"2019-08-06T12:09:12.375Z", "log.level": "INFO", "message":"Tomcat started on port(s): 8080 (http) with context path ''", "service.name":"spring-petclinic","process.thread.name":"restartedMain","event.dataset":"org.springframework.boot.web.embedded.tomcat.TomcatWebServer"}
-{"@timestamp":"2019-08-06T12:09:12.379Z", "log.level": "INFO", "message":"Started PetClinicApplication in 7.095 seconds (JVM running for 9.082)", "service.name":"spring-petclinic","process.thread.name":"restartedMain","event.dataset":"org.springframework.samples.petclinic.PetClinicApplication"}
-{"@timestamp":"2019-08-06T14:08:40.199Z", "log.level":"DEBUG", "message":"init find form", "service.name":"spring-petclinic","process.thread.name":"http-nio-8080-exec-8","event.dataset":"org.springframework.samples.petclinic.owner.OwnerController","transaction.id":"28b7fb8d5aba51f1","trace.id":"2869b25b5469590610fea49ac04af7da"}
+{"@timestamp":"2019-08-06T12:09:12.375Z", "log.level": "INFO", "message":"Tomcat started on port(s): 8080 (http) with context path ''", "service.name":"spring-petclinic","process.thread.name":"restartedMain","log.logger":"org.springframework.boot.web.embedded.tomcat.TomcatWebServer"}
+{"@timestamp":"2019-08-06T12:09:12.379Z", "log.level": "INFO", "message":"Started PetClinicApplication in 7.095 seconds (JVM running for 9.082)", "service.name":"spring-petclinic","process.thread.name":"restartedMain","log.logger":"org.springframework.samples.petclinic.PetClinicApplication"}
+{"@timestamp":"2019-08-06T14:08:40.199Z", "log.level":"DEBUG", "message":"init find form", "service.name":"spring-petclinic","process.thread.name":"http-nio-8080-exec-8","log.logger":"org.springframework.samples.petclinic.owner.OwnerController","transaction.id":"28b7fb8d5aba51f1","trace.id":"2869b25b5469590610fea49ac04af7da"}
 ```
 
 ## Why ECS logging?

ecs-logging-core/src/main/java/co/elastic/logging/EcsJsonSerializer.java

@@ -3,8 +3,6 @@
 import java.io.PrintWriter;
 import java.io.StringWriter;
 import java.util.Arrays;
-import java.util.Collections;
-import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
@@ -33,7 +31,7 @@ public static void serializeObjectEnd(StringBuilder builder) {
     }
 
     public static void serializeLoggerName(StringBuilder builder, String loggerName) {
-        builder.append("\"event.dataset\":\"");
+        builder.append("\"log.logger\":\"");
         JsonUtils.quoteAsString(loggerName, builder);
         builder.append("\",");
     }

ecs-logging-core/src/test/java/co/elastic/logging/AbstractEcsLoggingTest.java

@@ -28,6 +28,7 @@ void testMetadata() throws Exception {
         assertThat(getLastLogLine().get("service.name").textValue()).isEqualTo("test");
         assertThat(Instant.parse(getLastLogLine().get("@timestamp").textValue())).isCloseTo(Instant.now(), within(1, ChronoUnit.MINUTES));
         assertThat(getLastLogLine().get("log.level").textValue()).isEqualTo("DEBUG");
+        assertThat(getLastLogLine().get("log.logger")).isNotNull();
     }
 
     @Test