Latest version of uk.co.gresearch.spark:spark-extension_2.12
https://javadoc.io/doc/uk.co.gresearch.spark/spark-extension_2.12
Current version 2.9.0-3.4
https://javadoc.io/doc/uk.co.gresearch.spark/spark-extension_2.12/2.9.0-3.4
package-list path (used for javadoc generation -link option)
https://javadoc.io/doc/uk.co.gresearch.spark/spark-extension_2.12/2.9.0-3.4/package-list