The maven shade plugin is creating a file called dependency-reduced-pom.xml and also artifactname-shaded.jar and placing them in the base directory.
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You could use an old version of the plugin. Version 1.7 of the maven-shade-plugin writes to /target.
Since version 1.7.1, dependency-reduced pom.xml is written to basedir. See the issue MSHADE-124 for some reasons why it was done and what the consequences are. If you try setting dependencyReducedPomLocation, you will likely run into problems generating the site - open issue MSHADE-145.