Index downloads are disabled, search results may be incomplete

環境：Eclipse Luna Service Release 2 (4.4.2) + Maven 3.2.5

在pom.xml中添加依賴，會出現如下“Index downloads are disabled, search results may be incomplete”錯誤提示：

解決方案：

1、Window --> Preferences-->Maven 勾選"Download repository index updates on startup"

2、Window ---> Show View---> Maven Repositories ---> Global Repositories