Build option -Dfetch.sources.javadocs Ant / Ivy to retrieve sources and javadoc for dependencies is not working [LUCENE-8085]

It would be useful setting up the required configuration for Ant / Ivy in order to recover automatically javadocs and sources for dependencies, so you have no to attach those manually avoiding this situation:


**Start point:**

Ref: Ivy: How to Retrieve Source Codes of Dependencies
https://dzone.com/articles/ivy-how-retrieve-source-codes

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Migrated from [LUCENE-8085](https://issues.apache.org/jira/browse/LUCENE-8085) by Emerson Castaneda (@emecas), updated Dec 09 2017
Attachments: [lucene_dependencies.PNG](https://apache.github.io/lucene-jira-archive/attachments/LUCENE-8085/lucene_dependencies.PNG)
Linked issues:
- #5003

Start with the Ant/Ivy build configuration associated with the -Dfetch.sources.javadocs option, using the linked Ivy retrieval reference as background. Verify how dependencies are currently resolved and make the option retrieve their source and Javadoc artifacts automatically, without manual attachment; confirm the build still works with the option disabled.

Written by the indexing model from the issue text.