适配私有云，增加指定cos domain的参数cosEndPoint

Author: Ethan-Zhang

src/main/java/org/elasticsearch/repositories/cos/COSClientSettings.java

@@ -27,4 +27,5 @@ public class COSClientSettings {
     public static final Setting<ByteSizeValue> CHUNK_SIZE =
             byteSizeSetting("chunk_size", MAX_CHUNK_SIZE, MIN_CHUNK_SIZE, MAX_CHUNK_SIZE,
                     Setting.Property.NodeScope, Setting.Property.Dynamic);
+    public static final Setting<String> CosEndPoint = Setting.simpleString("cosEndPoint", Property.NodeScope, Property.Dynamic);
 }

src/main/java/org/elasticsearch/repositories/cos/COSRepositoryPlugin.java

@@ -4,16 +4,11 @@
 import java.util.List;
 import java.util.Arrays;
 import java.util.Map;
-import java.security.AccessController;
-import java.security.PrivilegedAction;
-
-import org.elasticsearch.SpecialPermission;
 import org.elasticsearch.cluster.metadata.RepositoryMetaData;
 import org.elasticsearch.common.xcontent.NamedXContentRegistry;
 import org.elasticsearch.env.Environment;
 import org.elasticsearch.plugins.Plugin;
 import org.elasticsearch.plugins.RepositoryPlugin;
-import org.elasticsearch.common.settings.Settings;
 import org.elasticsearch.common.settings.Setting;
 import org.elasticsearch.repositories.Repository;
 import org.elasticsearch.threadpool.ThreadPool;
@@ -40,6 +35,6 @@ public Map<String, Repository.Factory> getRepositories(final Environment env,
     public List<Setting<?>> getSettings() {
         return Arrays.asList(COSClientSettings.REGION, COSClientSettings.ACCESS_KEY_ID, COSClientSettings.ACCESS_KEY_SECRET,
                 COSClientSettings.APP_ID, COSClientSettings.BUCKET,
-                COSClientSettings.BASE_PATH, COSClientSettings.COMPRESS, COSClientSettings.CHUNK_SIZE);
+                COSClientSettings.BASE_PATH, COSClientSettings.COMPRESS, COSClientSettings.CHUNK_SIZE, COSClientSettings.CosEndPoint);
     }
 }

src/main/java/org/elasticsearch/repositories/cos/COSService.java

@@ -28,9 +28,11 @@ private synchronized COSClient createClient(RepositoryMetaData metaData) {
         String access_key_id = COSRepository.getSetting(COSClientSettings.ACCESS_KEY_ID, metaData);
         String access_key_secret = COSRepository.getSetting(COSClientSettings.ACCESS_KEY_SECRET, metaData);
         String region = COSRepository.getSetting(COSClientSettings.REGION, metaData);
+        String endPoint = COSRepository.getSetting(COSClientSettings.CosEndPoint, metaData);
 
         COSCredentials cred = new BasicCOSCredentials(access_key_id, access_key_secret);
         ClientConfig clientConfig = new ClientConfig(new Region(region));
+        clientConfig.setEndPointSuffix(endPoint);
         COSClient client = new COSClient(cred, clientConfig);
 
         return client;