pom-plugin-asciidoctor-maven-plugin.xml

<plugin>
   <groupId>org.asciidoctor</groupId>
   <artifactId>asciidoctor-maven-plugin</artifactId>
   <version>1.5.6</version>
   <executions>
      <execution>
         <id>generate-docs</id>
         <phase>prepare-package</phase>
         <goals>
            <goal>process-asciidoc</goal>
         </goals>
         <configuration>
            <sourceDocumentName>index.adoc</sourceDocumentName>
            <backend>html</backend>
            <attributes>
               <snippets>${project.build.directory}/generated-snippets</snippets>
            </attributes>
         </configuration>
      </execution>
   </executions>
</plugin>