migrate EnvironmentBridge to interface pattern

Author: yaauie

libs/logstash-bridge/src/main/java/org/elasticsearch/logstashbridge/env/EnvironmentBridge.java

@@ -17,21 +17,23 @@
 /**
  * An external bridge for {@link Environment}
  */
-public class EnvironmentBridge extends StableBridgeAPI.ProxyInternal<Environment> {
-    public static EnvironmentBridge fromInternal(final Environment delegate) {
-        return new EnvironmentBridge(delegate);
+public interface EnvironmentBridge extends StableBridgeAPI<Environment> {
+    static EnvironmentBridge fromInternal(final Environment delegate) {
+        return new EnvironmentBridge.ProxyInternal(delegate);
     }
 
-    public EnvironmentBridge(final SettingsBridge settingsBridge, final Path configPath) {
-        this(new Environment(settingsBridge.toInternal(), configPath));
+    static EnvironmentBridge create(final SettingsBridge bridgedSettings, final Path configPath) {
+        return fromInternal(new Environment(bridgedSettings.toInternal(), configPath));
     }
 
-    private EnvironmentBridge(final Environment delegate) {
-        super(delegate);
-    }
+    class ProxyInternal extends StableBridgeAPI.ProxyInternal<Environment> implements EnvironmentBridge {
+        private ProxyInternal(final Environment delegate) {
+            super(delegate);
+        }
 
-    @Override
-    public Environment toInternal() {
-        return this.internalDelegate;
+        @Override
+        public Environment toInternal() {
+            return this.internalDelegate;
+        }
     }
 }