Modify idea run configurations

This adds the DEBUG_PORT run configurations for the second and third
Elasticsearch node configuration in IntelliJ. The first configuration
already contains these parts, when I use a three node setup for
debugging my IDE always adds this section automatically so we might as
well keep it checked in. The ports 5008 and 5009 for the second and
third port are what is already mentioned in TESTING.md

Author: cbuescher