<dependency>
  <groupId>org.apache.maven.indexer</groupId>
  <artifactId>indexer-core</artifactId>
  <version>5.1.1</version>
</dependency>

'org.apache.maven.indexer:indexer-core:jar:5.1.1'

<dependency org="org.apache.maven.indexer" name="indexer-core" rev="5.1.1">
  <artifact name="indexer-core" type="jar" />
</dependency>

@Grapes(
@Grab(group='org.apache.maven.indexer', module='indexer-core', version='5.1.1')
)

compile 'org.apache.maven.indexer:indexer-core:5.1.1'

[org.apache.maven.indexer/indexer-core "5.1.1"]

libraryDependencies += "org.apache.maven.indexer" %% "indexer-core" % "5.1.1"