[Issue-27716]: CONTRIBUTING.md IntelliJ configurations settings are confusing. (#27717)
[Issue-27716]: CONTRIBUTING.md IntelliJ configurations settings are confusing. (#27717)

* Improved paragraph describing how to run unit tests from Intellij.
* Added information about how to run a local copy of elasticsearch from the source.
strapdata/elassandra,strapdata/elassandra,vroyer/elasticassandra,strapdata/elassandra,vroyer/elassandra,vroyer/elassandra,vroyer/elasticassandra,strapdata/elassandra,strapdata/elassandra,vroyer/elassandra,vroyer/elasticassandra