Clean up imports in analysis_server and analyzer_cli (and one missed in analyzer)

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

Index: pkg/analysis_server/lib/src/services/index/local_index.dart
diff --git a/pkg/analysis_server/lib/src/services/index/local_index.dart b/pkg/analysis_server/lib/src/services/index/local_index.dart
index 115b3e16a5d71ec1d3ad9229ca90d48d779e8cb2..34c0e76691fb601971fcff6115bdf99cff98ffe2 100644
--- a/pkg/analysis_server/lib/src/services/index/local_index.dart
+++ b/pkg/analysis_server/lib/src/services/index/local_index.dart
@@ -9,7 +9,7 @@ import 'dart:async';
 import 'package:analysis_server/src/provisional/index/index_core.dart';
 import 'package:analysis_server/src/services/index/index.dart';
 import 'package:analysis_server/src/services/index/store/split_store.dart';
-import 'package:analyzer/src/generated/element.dart';
+import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/source.dart';