remove dead code

Author: ywangd

modules/repository-s3/src/test/java/org/elasticsearch/repositories/s3/S3ClientsManagerTests.java

@@ -10,13 +10,6 @@
 package org.elasticsearch.repositories.s3;
 
 import joptsimple.internal.Strings;
-import software.amazon.awssdk.auth.credentials.AwsBasicCredentials;
-import software.amazon.awssdk.http.ExecutableHttpRequest;
-import software.amazon.awssdk.http.HttpExecuteRequest;
-import software.amazon.awssdk.http.SdkHttpClient;
-import software.amazon.awssdk.identity.spi.AwsCredentialsIdentity;
-import software.amazon.awssdk.regions.Region;
-
 import org.elasticsearch.cluster.ClusterState;
 import org.elasticsearch.cluster.metadata.Metadata;
 import org.elasticsearch.cluster.metadata.ProjectId;
@@ -35,6 +28,9 @@
 import org.elasticsearch.test.ESTestCase;
 import org.elasticsearch.threadpool.TestThreadPool;
 import org.elasticsearch.watcher.ResourceWatcherService;
+import software.amazon.awssdk.auth.credentials.AwsBasicCredentials;
+import software.amazon.awssdk.identity.spi.AwsCredentialsIdentity;
+import software.amazon.awssdk.regions.Region;
 
 import java.nio.charset.StandardCharsets;
 import java.time.Duration;
@@ -463,17 +459,4 @@ private String projectClientAccessKey(ProjectId projectId, String clientName) {
     private String projectClientSecretKey(ProjectId projectId, String clientName) {
         return projectId + "_" + clientName + "_secret_key_" + s3SecretsIdGenerators.get(projectId).get();
     }
-
-    private static class DummySdkHttpClient implements SdkHttpClient {
-
-        static final SdkHttpClient INSTANCE = new DummySdkHttpClient();
-
-        @Override
-        public ExecutableHttpRequest prepareRequest(HttpExecuteRequest request) {
-            return null;
-        }
-
-        @Override
-        public void close() {}
-    }
 }