Settings: Fix setting groups to include secure settings (#25076)

This commit fixes the group methdos of Settings to properly include
grouped secure settings. Previously the secure settings were included
but without the group prefix being removed.

closes #25069

Author: rjernst

core/src/main/java/org/elasticsearch/common/settings/Settings.java

@@ -507,35 +507,21 @@ public Map<String, Settings> getGroups(String settingPrefix, boolean ignoreNonGr
     }
 
     private Map<String, Settings> getGroupsInternal(String settingPrefix, boolean ignoreNonGrouped) throws SettingsException {
-        // we don't really care that it might happen twice
-        Map<String, Map<String, String>> map = new LinkedHashMap<>();
-        for (Object o : settings.keySet()) {
-            String setting = (String) o;
-            if (setting.startsWith(settingPrefix)) {
-                String nameValue = setting.substring(settingPrefix.length());
-                int dotIndex = nameValue.indexOf('.');
-                if (dotIndex == -1) {
-                    if (ignoreNonGrouped) {
-                        continue;
-                    }
-                    throw new SettingsException("Failed to get setting group for [" + settingPrefix + "] setting prefix and setting ["
-                            + setting + "] because of a missing '.'");
-                }
-                String name = nameValue.substring(0, dotIndex);
-                String value = nameValue.substring(dotIndex + 1);
-                Map<String, String> groupSettings = map.get(name);
-                if (groupSettings == null) {
-                    groupSettings = new LinkedHashMap<>();
-                    map.put(name, groupSettings);
+        Settings prefixSettings = getByPrefix(settingPrefix);
+        Map<String, Settings> groups = new HashMap<>();
+        for (String groupName : prefixSettings.names()) {
+            Settings groupSettings = prefixSettings.getByPrefix(groupName + ".");
+            if (groupSettings.isEmpty()) {
+                if (ignoreNonGrouped) {
+                    continue;
                 }
-                groupSettings.put(value, get(setting));
+                throw new SettingsException("Failed to get setting group for [" + settingPrefix + "] setting prefix and setting ["
+                    + settingPrefix + groupName + "] because of a missing '.'");
             }
+            groups.put(groupName, groupSettings);
         }
-        Map<String, Settings> retVal = new LinkedHashMap<>();
-        for (Map.Entry<String, Map<String, String>> entry : map.entrySet()) {
-            retVal.put(entry.getKey(), new Settings(Collections.unmodifiableMap(entry.getValue()), secureSettings));
-        }
-        return Collections.unmodifiableMap(retVal);
+
+        return Collections.unmodifiableMap(groups);
     }
     /**
      * Returns group settings for the given setting prefix.

core/src/test/java/org/elasticsearch/common/settings/SettingsTests.java

@@ -38,6 +38,7 @@
 import static org.hamcrest.Matchers.allOf;
 import static org.hamcrest.Matchers.arrayContaining;
 import static org.hamcrest.Matchers.contains;
+import static org.hamcrest.Matchers.containsInAnyOrder;
 import static org.hamcrest.Matchers.containsString;
 import static org.hamcrest.Matchers.equalTo;
 import static org.hamcrest.Matchers.hasToString;
@@ -525,6 +526,29 @@ public void testSecureSettingsPrefix() {
         assertTrue(prefixSettings.names().contains("foo"));
     }
 
+    public void testGroupPrefix() {
+        MockSecureSettings secureSettings = new MockSecureSettings();
+        secureSettings.setString("test.key1.foo", "somethingsecure");
+        secureSettings.setString("test.key1.bar", "somethingsecure");
+        secureSettings.setString("test.key2.foo", "somethingsecure");
+        secureSettings.setString("test.key2.bog", "somethingsecure");
+        Settings.Builder builder = Settings.builder();
+        builder.put("test.key1.baz", "blah1");
+        builder.put("test.key1.other", "blah2");
+        builder.put("test.key2.baz", "blah3");
+        builder.put("test.key2.else", "blah4");
+        builder.setSecureSettings(secureSettings);
+        Settings settings = builder.build();
+        Map<String, Settings> groups = settings.getGroups("test");
+        assertEquals(2, groups.size());
+        Settings key1 = groups.get("key1");
+        assertNotNull(key1);
+        assertThat(key1.names(), containsInAnyOrder("foo", "bar", "baz", "other"));
+        Settings key2 = groups.get("key2");
+        assertNotNull(key2);
+        assertThat(key2.names(), containsInAnyOrder("foo", "bog", "baz", "else"));
+    }
+
     public void testEmptyFilterMap() {
         Settings.Builder builder = Settings.builder();
         builder.put("a", "a1");