Change default Java Util Logging format

distribution/tools/server-cli/src/main/java/org/elasticsearch/server/cli/SystemJvmOptions.java

@@ -60,10 +60,16 @@ static List<String> systemJvmOptions() {
              * explore alternatives. See org.elasticsearch.xpack.searchablesnapshots.preallocate.Preallocate.
              */
             "--add-opens=java.base/java.io=org.elasticsearch.preallocate",
+            javaUtilLoggingDefaultFormat(),
             maybeOverrideDockerCgroup()
         ).stream().filter(e -> e.isEmpty() == false).collect(Collectors.toList());
     }
 
+    // scope for testing
+    static String javaUtilLoggingDefaultFormat() {
+        return "-Djava.util.logging.SimpleFormatter.format=[%4$s][%3$s] %5$s%6$s%n";
+    }
+
     /*
      * The virtual file /proc/self/cgroup should list the current cgroup
      * membership. For each hierarchy, you can follow the cgroup path from

distribution/tools/server-cli/src/test/java/org/elasticsearch/server/cli/JavaUtilLoggingFormatTests.java

@@ -0,0 +1,57 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0 and the Server Side Public License, v 1; you may not use this file except
+ * in compliance with, at your election, the Elastic License 2.0 or the Server
+ * Side Public License, v 1.
+ */
+
+package org.elasticsearch.server.cli;
+
+import org.elasticsearch.core.SuppressForbidden;
+import org.elasticsearch.test.ESTestCase;
+import org.junit.BeforeClass;
+
+import java.io.ByteArrayOutputStream;
+import java.io.PrintStream;
+import java.util.logging.Logger;
+
+import static org.hamcrest.Matchers.equalTo;
+
+public class JavaUtilLoggingFormatTests extends ESTestCase {
+    @BeforeClass
+    public static void init() {
+        assert "false".equals(System.getProperty("tests.security.manager")) : "-Dtests.security.manager=false has to be set";
+    }
+
+    @SuppressForbidden(reason = "testing the behaviour of 3rd party using jul")
+    public void testJavaUtilLoggingFormat() {
+        String key = key(SystemJvmOptions.javaUtilLoggingDefaultFormat());
+        String value = value(SystemJvmOptions.javaUtilLoggingDefaultFormat());
+        System.setProperty(key, value);
+
+        final ByteArrayOutputStream myOut = new ByteArrayOutputStream();
+        PrintStream err = System.err;
+        PrintStream out = System.out;
+        try {
+            System.setErr(new PrintStream(myOut));
+            System.setOut(new PrintStream(myOut));
+
+            Logger.getLogger("any").info("message");
+
+            assertThat(myOut.toString(), equalTo("[INFO][any] message\n"));
+        } finally {
+            System.setOut(out);
+            System.setErr(err);
+            System.getProperties().remove(key);
+        }
+    }
+
+    public String key(String s) {
+        return s.split("=")[0].substring(2);
+    }
+
+    public String value(String s) {
+        return s.split("=")[1];
+    }
+}