meta-plugin should install bin and config at the top level (#28162)

This change modifies the installation for a meta plugin,
the content of the config and bin directory inside each bundled plugins are now moved in the meta plugin directory.
So instead of `$configDir/meta-plugin-name/bundled_plugin/name/` the content of the config
for a bundled plugin is now in `$configDir/meta-plugin-name`. Same applies for the bin directory.

distribution/tools/plugin-cli/src/main/java/org/elasticsearch/plugins/InstallPluginCommand.java

@@ -667,7 +667,7 @@ private void installMetaPlugin(Terminal terminal, boolean isBatch, Path tmpRoot,
             pluginInfos.add(info);
             Path tmpBinDir = plugin.resolve("bin");
             if (Files.exists(tmpBinDir)) {
-                Path destBinDir = env.binFile().resolve(metaInfo.getName()).resolve(info.getName());
+                Path destBinDir = env.binFile().resolve(metaInfo.getName());
                 deleteOnFailure.add(destBinDir);
                 installBin(info, tmpBinDir, destBinDir);
             }
@@ -676,7 +676,7 @@ private void installMetaPlugin(Terminal terminal, boolean isBatch, Path tmpRoot,
             if (Files.exists(tmpConfigDir)) {
                 // some files may already exist, and we don't remove plugin config files on plugin removal,
                 // so any installed config files are left on failure too
-                Path destConfigDir = env.configFile().resolve(metaInfo.getName()).resolve(info.getName());
+                Path destConfigDir = env.configFile().resolve(metaInfo.getName());
                 installConfig(info, tmpConfigDir, destConfigDir);
             }
         }
@@ -744,7 +744,6 @@ public FileVisitResult postVisitDirectory(final Path dir, final IOException exc)
         });
     }
 
-
     /** Copies the files from {@code tmpBinDir} into {@code destBinDir}, along with permissions from dest dirs parent. */
     private void installBin(PluginInfo info, Path tmpBinDir, Path destBinDir) throws Exception {
         if (Files.isDirectory(tmpBinDir) == false) {

distribution/tools/plugin-cli/src/test/java/org/elasticsearch/plugins/InstallPluginCommandTests.java

@@ -266,18 +266,17 @@ MockTerminal installPlugin(String pluginUrl, Path home, InstallPluginCommand com
     }
 
     void assertMetaPlugin(String metaPlugin, String name, Path original, Environment env) throws IOException {
-        assertPluginInternal(name, original, env,
-            env.pluginsFile().resolve(metaPlugin), env.configFile().resolve(metaPlugin), env.binFile().resolve(metaPlugin));
+        assertPluginInternal(name, env.pluginsFile().resolve(metaPlugin));
+        assertConfigAndBin(metaPlugin, original, env);
     }
 
-
     void assertPlugin(String name, Path original, Environment env) throws IOException {
-        assertPluginInternal(name, original, env,
-            env.pluginsFile(), env.configFile(), env.binFile());
+        assertPluginInternal(name, env.pluginsFile());
+        assertConfigAndBin(name, original, env);
+        assertInstallCleaned(env);
     }
 
-    void assertPluginInternal(String name, Path original, Environment env,
-                              Path pluginsFile, Path configFile, Path binFile) throws IOException {
+    void assertPluginInternal(String name, Path pluginsFile) throws IOException {
         Path got = pluginsFile.resolve(name);
         assertTrue("dir " + name + " exists", Files.exists(got));
 
@@ -294,17 +293,19 @@ void assertPluginInternal(String name, Path original, Environment env,
                     PosixFilePermission.OTHERS_READ,
                     PosixFilePermission.OTHERS_EXECUTE));
         }
-
         assertTrue("jar was copied", Files.exists(got.resolve("plugin.jar")));
         assertFalse("bin was not copied", Files.exists(got.resolve("bin")));
         assertFalse("config was not copied", Files.exists(got.resolve("config")));
+    }
+
+    void assertConfigAndBin(String name, Path original, Environment env) throws IOException {
         if (Files.exists(original.resolve("bin"))) {
-            Path binDir = binFile.resolve(name);
+            Path binDir = env.binFile().resolve(name);
             assertTrue("bin dir exists", Files.exists(binDir));
             assertTrue("bin is a dir", Files.isDirectory(binDir));
             PosixFileAttributes binAttributes = null;
             if (isPosix) {
-                binAttributes = Files.readAttributes(binFile, PosixFileAttributes.class);
+                binAttributes = Files.readAttributes(env.binFile(), PosixFileAttributes.class);
             }
             try (DirectoryStream<Path> stream = Files.newDirectoryStream(binDir)) {
                 for (Path file : stream) {
@@ -317,7 +318,7 @@ void assertPluginInternal(String name, Path original, Environment env,
             }
         }
         if (Files.exists(original.resolve("config"))) {
-            Path configDir = configFile.resolve(name);
+            Path configDir = env.configFile().resolve(name);
             assertTrue("config dir exists", Files.exists(configDir));
             assertTrue("config is a dir", Files.isDirectory(configDir));
 
@@ -326,7 +327,7 @@ void assertPluginInternal(String name, Path original, Environment env,
 
             if (isPosix) {
                 PosixFileAttributes configAttributes =
-                        Files.getFileAttributeView(configFile, PosixFileAttributeView.class).readAttributes();
+                        Files.getFileAttributeView(env.configFile(), PosixFileAttributeView.class).readAttributes();
                 user = configAttributes.owner();
                 group = configAttributes.group();
 
@@ -351,7 +352,6 @@ void assertPluginInternal(String name, Path original, Environment env,
                 }
             }
         }
-        assertInstallCleaned(env);
     }
 
     void assertInstallCleaned(Environment env) throws IOException {
@@ -734,7 +734,7 @@ public void testExistingConfig() throws Exception {
 
     public void testExistingMetaConfig() throws Exception {
         Tuple<Path, Environment> env = createEnv(fs, temp);
-        Path envConfigDir = env.v2().configFile().resolve("my_plugins").resolve("fake");
+        Path envConfigDir = env.v2().configFile().resolve("my_plugins");
         Files.createDirectories(envConfigDir);
         Files.write(envConfigDir.resolve("custom.yml"), "existing config".getBytes(StandardCharsets.UTF_8));
         Path metaDir = createPluginDir(temp);