Document how to test a dev version of a 3party dependency (#78962)
Document how to test a dev version of a 3party dependency (#78962)

* Document how to test a dev version of a 3party dependency

- Introduce a FAQ section to BUILDING.MD
- Provide three solutions to test and use a custom third party dependency
in our elasticsearch build

* Fix jitpack repo declaration

* Tweak formatting

* Apply review feedback

Co-authored-by: Rory Hunter <949632dd5e0e2f233a1a83430447d4697617f6ba@users.noreply.github.com>

* Apply further review feedback

Co-authored-by: Rory Hunter <949632dd5e0e2f233a1a83430447d4697617f6ba@users.noreply.github.com>

* Tweak recommendations for replacing a dependency

Apply review feedback

* Elaborate on dependency declaration to resolves jars from flat dir repositories

Co-authored-by: Rory Hunter <949632dd5e0e2f233a1a83430447d4697617f6ba@users.noreply.github.com>
GlenRSmith/elasticsearch,GlenRSmith/elasticsearch,GlenRSmith/elasticsearch,GlenRSmith/elasticsearch,GlenRSmith/elasticsearch