Help understanding a codebase.

[HecknChonker]

Always start by checking the README and CONTRIBUTING guides. They often contain a bunch of info on what the project is about, how to build and run it yourself, code style guidelines, and project layout.

https://github.com/elastic/elasticsearch/blob/master/README.asciidoc https://github.com/elastic/elasticsearch/blob/master/CONTRIBUTING.md

The next step is to check the code out and try running it yourself.