Deprecate the no-jdk distributions (#64275)

This commit adds logging to indicate that the no-jdk distributions are
deprecated and will be removed in a future release.

distribution/src/bin/elasticsearch-env

@@ -92,6 +92,10 @@ ES_DISTRIBUTION_FLAVOR=${es.distribution.flavor}
 ES_DISTRIBUTION_TYPE=${es.distribution.type}
 ES_BUNDLED_JDK=${es.bundled_jdk}
 
+if [[ "$ES_BUNDLED_JDK" == "false" ]]; then
+  echo "warning: no-jdk distributions that do not bundle a JDK are deprecated and will be removed in a future release" >&2
+fi
+
 if [[ "$ES_DISTRIBUTION_TYPE" == "docker" ]]; then
   # Allow environment variables to be set by creating a file with the
   # contents, and setting an environment variable with the suffix _FILE to

distribution/src/bin/elasticsearch-env.bat

@@ -29,6 +29,10 @@ set ES_DISTRIBUTION_FLAVOR=${es.distribution.flavor}
 set ES_DISTRIBUTION_TYPE=${es.distribution.type}
 set ES_BUNDLED_JDK=${es.bundled_jdk}
 
+if "%ES_BUNDLED_JDK%" == "false" (
+  echo "warning: no-jdk distributions that do not bundle a JDK are deprecated and will be removed in a future release" >&2
+)
+
 cd /d "%ES_HOME%"
 
 rem now set the path to java, pass "nojava" arg to skip setting JAVA_HOME and JAVA

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

@@ -70,6 +70,7 @@
 import org.elasticsearch.common.inject.ModulesBuilder;
 import org.elasticsearch.common.io.stream.NamedWriteableRegistry;
 import org.elasticsearch.common.lease.Releasables;
+import org.elasticsearch.common.logging.DeprecationLogger;
 import org.elasticsearch.common.logging.HeaderWarning;
 import org.elasticsearch.common.logging.NodeAndClusterIdStateListener;
 import org.elasticsearch.common.network.NetworkAddress;
@@ -252,10 +253,15 @@ public class Node implements Closeable {
     private final Lifecycle lifecycle = new Lifecycle();
 
     /**
-     * Logger initialized in the ctor because if it were initialized statically
-     * then it wouldn't get the node name.
+     * This logger instance is an instance field as opposed to a static field. This ensures that the field is not
+     * initialized until an instance of Node is constructed, which is sure to happen after the logging infrastructure
+     * has been initialized to include the hostname. If this field were static, then it would be initialized when the
+     * class initializer runs. Alas, this happens too early, before logging is initialized as this class is referred to
+     * in InternalSettingsPreparer#finalizeSettings, which runs when creating the Environment, before logging is
+     * initialized.
      */
-    private final Logger logger;
+    private final Logger logger = LogManager.getLogger(Node.class);
+    private final DeprecationLogger deprecationLogger = DeprecationLogger.getLogger(Node.class);
     private final Injector injector;
     private final Environment environment;
     private final NodeEnvironment nodeEnvironment;
@@ -280,7 +286,6 @@ public Node(Environment environment) {
      */
     protected Node(final Environment initialEnvironment,
                    Collection<Class<? extends Plugin>> classpathPlugins, boolean forbidPrivateIndexSettings) {
-        logger = LogManager.getLogger(Node.class);
         final List<Closeable> resourcesToClose = new ArrayList<>(); // register everything we need to release in the case of an error
         boolean success = false;
         try {
@@ -307,6 +312,9 @@ protected Node(final Environment initialEnvironment,
                 logger.info("JVM home [{}], using bundled JDK [{}]", System.getProperty("java.home"), jvmInfo.getUsingBundledJdk());
             } else {
                 logger.info("JVM home [{}]", System.getProperty("java.home"));
+                deprecationLogger.deprecate(
+                    "no-jdk",
+                    "no-jdk distributions that do not bundle a JDK are deprecated and will be removed in a future release");
             }
             logger.info("JVM arguments {}", Arrays.toString(jvmInfo.getInputArguments()));
             if (Build.CURRENT.isProductionRelease() == false) {

test/framework/src/main/java/org/elasticsearch/test/ESTestCase.java

@@ -98,6 +98,7 @@
 import org.elasticsearch.index.analysis.TokenFilterFactory;
 import org.elasticsearch.index.analysis.TokenizerFactory;
 import org.elasticsearch.indices.analysis.AnalysisModule;
+import org.elasticsearch.monitor.jvm.JvmInfo;
 import org.elasticsearch.plugins.AnalysisPlugin;
 import org.elasticsearch.plugins.Plugin;
 import org.elasticsearch.script.MockScriptEngine;
@@ -408,7 +409,17 @@ private void ensureNoWarnings() {
         //appropriate test
         try {
             final List<String> warnings = threadContext.getResponseHeaders().get("Warning");
-            assertNull("unexpected warning headers", warnings);
+            if (warnings != null && JvmInfo.jvmInfo().getBundledJdk() == false) {
+                // unit tests do not run with the bundled JDK, if there are warnings we need to filter the no-jdk deprecation warning
+                final List<String> filteredWarnings = warnings
+                    .stream()
+                    .filter(k -> k.contains(
+                        "no-jdk distributions that do not bundle a JDK are deprecated and will be removed in a future release") == false)
+                    .collect(Collectors.toList());
+                assertThat("unexpected warning headers", filteredWarnings, empty());
+            } else {
+                assertNull("unexpected warning headers", warnings);
+            }
         } finally {
             resetDeprecationLogger();
         }