Remove old index and search implementations.

pkg/analysis_server/lib/src/services/index/local_file_index.dart

-// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-library services.index.local_file_index;
-
-import 'package:analysis_server/src/services/index/index.dart';
-import 'package:analysis_server/src/services/index/local_index.dart';
-import 'package:analysis_server/src/services/index/store/codec.dart';
-import 'package:analysis_server/src/services/index/store/split_store.dart';
-import 'package:analysis_server/src/services/index/store/temporary_folder_file_manager.dart';
-import 'package:analyzer/src/generated/engine.dart';
-
-Index createLocalFileIndex() {
-  var fileManager = new TemporaryFolderFileManager();
-  var stringCodec = new StringCodec();
-  var nodeManager = new FileNodeManager(
-      fileManager,
-      AnalysisEngine.instance.logger,
-      stringCodec,
-      new ContextCodec(),
-      new ElementCodec(stringCodec),
-      new RelationshipCodec(stringCodec));
-  return new LocalIndex(nodeManager);
-}