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.
You can avoid having it created by setting createDependencyReducedPom to false.
createDependencyReducedPom
e.g.
org.apache.maven.plugins maven-shade-plugin ${maven-shade-plugin.version} false .... ....
See more detail from apache