In this chapter, we illustrated a set of contribution modules that are not part of the Solr core but definitely useful in a lot of real scenarios. The Solr download bundle contains all of them, and their installation is very easy. Each module folder has a README file that guides you through installation and setup steps (basically, it's just a matter of copying, pasting, and configuring).

In the next chapter, we will conclude our Solr path with an overview about the Solr code base. You will learn how to work with it and eventually how to contribute to the open source community process.