This is a general step that happens when m2e/m2eclipse (Maven integration for Eclipse) is installed, whether projects are actively using it or not.
这是因为m2eclipse(maven插件)要在启动时需要进行的一个步骤。

This step can be disabled through the Eclipse preferences: Window / Preferences / Maven / "Download repository index updates on startup". This option is on the main "Maven" preference page (not a child page). Just uncheck the box to prevent this from happening.
我们可以停止这个动作。方法：Windows -> Preferences -> Maven 取消勾选 Download repository index updates on startup