Log whether or not we are using the bundled JDK (#64255)

This commit adds logging to indicate whether or not we are using the
bundled JDK. We distinguish between using a distribution that bundles
the JDK versus using a distribution that does not bundle the JDK.

server/src/main/java/org/elasticsearch/node/Node.java

@@ -316,7 +316,11 @@ protected Node(final Environment initialEnvironment,
                 Constants.JVM_NAME,
                 Constants.JAVA_VERSION,
                 Constants.JVM_VERSION);
-            logger.info("JVM home [{}]", System.getProperty("java.home"));
+            if (jvmInfo.getBundledJdk()) {
+                logger.info("JVM home [{}], using bundled JDK [{}]", System.getProperty("java.home"), jvmInfo.getUsingBundledJdk());
+            } else {
+                logger.info("JVM home [{}]", System.getProperty("java.home"));
+            }
             logger.info("JVM arguments {}", Arrays.toString(jvmInfo.getInputArguments()));
             if (Build.CURRENT.isProductionRelease() == false) {
                 logger.warn(