Upgrade to Log4j 2.9.0

This commit upgrades the Log4j dependency from version 2.8.2 to version
2.9.0.

Relates #26450

buildSrc/version.properties

@@ -8,7 +8,7 @@ jts               = 1.13
 jackson           = 2.8.6
 snakeyaml         = 1.15
 # When updating log4j, please update also docs/java-api/index.asciidoc
-log4j             = 2.8.2
+log4j             = 2.9.0
 slf4j             = 1.6.2
 
 # when updating the JNA version, also update the version in buildSrc/build.gradle

core/build.gradle

@@ -157,12 +157,11 @@ thirdPartyAudit.excludes = [
   'com.fasterxml.jackson.databind.ObjectMapper',
 
   // from log4j
-  'com.beust.jcommander.IStringConverter',
-  'com.beust.jcommander.JCommander',
   'com.conversantmedia.util.concurrent.DisruptorBlockingQueue',
   'com.conversantmedia.util.concurrent.SpinPolicy',
   'com.fasterxml.jackson.annotation.JsonInclude$Include',
   'com.fasterxml.jackson.databind.DeserializationContext',
+  'com.fasterxml.jackson.databind.DeserializationFeature',
   'com.fasterxml.jackson.databind.JsonMappingException',
   'com.fasterxml.jackson.databind.JsonNode',
   'com.fasterxml.jackson.databind.Module$SetupContext',
@@ -203,11 +202,11 @@ thirdPartyAudit.excludes = [
   'javax.jms.Connection',
   'javax.jms.ConnectionFactory',
   'javax.jms.Destination',
+  'javax.jms.JMSException',
+  'javax.jms.MapMessage',
   'javax.jms.Message',
   'javax.jms.MessageConsumer',
-  'javax.jms.MessageListener',
   'javax.jms.MessageProducer',
-  'javax.jms.ObjectMessage',
   'javax.jms.Session',
   'javax.mail.Authenticator',
   'javax.mail.Message$RecipientType',
@@ -247,6 +246,7 @@ thirdPartyAudit.excludes = [
   'org.osgi.framework.BundleEvent',
   'org.osgi.framework.BundleReference',
   'org.osgi.framework.FrameworkUtil',
+  'org.osgi.framework.ServiceRegistration',
   'org.osgi.framework.SynchronousBundleListener',
   'org.osgi.framework.wiring.BundleWire',
   'org.osgi.framework.wiring.BundleWiring',

core/licenses/log4j-1.2-api-2.8.2.jar.sha1

@@ -1 +0,0 @@
-f1543534b8413aac91fa54d1fff65dfff76818cd

core/licenses/log4j-1.2-api-2.9.0.jar.sha1

@@ -0,0 +1 @@
+7e2f1637394eecdc3c8cd067b3f2cf4801b1bcf6

core/licenses/log4j-api-2.8.2.jar.sha1

@@ -1 +0,0 @@
-e590eeb783348ce8ddef205b82127f9084d82bf3

core/licenses/log4j-api-2.9.0.jar.sha1

@@ -0,0 +1 @@
+e0dcd508dfc4864a2f5a1963d6ffad170d970375

core/licenses/log4j-core-2.8.2.jar.sha1

@@ -1 +0,0 @@
-979fc0cf8460302e4ffbfe38c1b66a99450b0bb7

core/licenses/log4j-core-2.9.0.jar.sha1

@@ -0,0 +1 @@
+052f6548ae1688e126c29b5dc400929dc0128615

core/src/main/java/org/elasticsearch/common/logging/ESLoggerFactory.java

@@ -46,7 +46,12 @@ public final class ESLoggerFactory {
     }
 
     public static Logger getLogger(String prefix, Class<?> clazz) {
-        return getLogger(prefix, LogManager.getLogger(clazz));
+        /*
+         * Do not use LogManager#getLogger(Class) as this now uses Class#getCanonicalName under the hood; as this returns null for local and
+         * anonymous classes, any place we create, for example, an abstract component defined as an anonymous class (e.g., in tests) will
+         * result in a logger with a null name which will blow up in a lookup inside of Log4j.
+         */
+        return getLogger(prefix, LogManager.getLogger(clazz.getName()));
     }
 
     public static Logger getLogger(String prefix, Logger logger) {

docs/java-api/index.asciidoc

@@ -83,7 +83,7 @@ You need to also include Log4j 2 dependencies:
 <dependency>
     <groupId>org.apache.logging.log4j</groupId>
     <artifactId>log4j-core</artifactId>
-    <version>2.8.2</version>
+    <version>2.9.0</version>
 </dependency>
 --------------------------------------------------
 
@@ -111,7 +111,7 @@ If you want to use another logger than Log4j 2, you can use http://www.slf4j.org
 <dependency>
     <groupId>org.apache.logging.log4j</groupId>
     <artifactId>log4j-to-slf4j</artifactId>
-    <version>2.8.2</version>
+    <version>2.9.0</version>
 </dependency>
 <dependency>
     <groupId>org.slf4j</groupId>