IDEA update indices 的问题

解决办法：

1. Open IntelliJ IDEA
2. Select the File menu
3. Select the Invalidate Caches / Restart... menu. Once selected you get a pop-up with a bunch of options.
4. Select Invalidate and Restart and before doing that make sure you saved all your changes else it might delete some unsaved changes.

来源：oschina

链接：https://my.oschina.net/u/2619918/blog/617827