RTGOV-462, Embedded ES server, single instance per class loader

configured via rtgov-es.properties. Features allow 
  - 1: Single embedded node to be started on EAP. data from rtgov is stored here. 
     - Single node can join a cluster,becoming a working member of ES cluster.
  - 2: start as a light weight node that does not hold data but connects to a cluster. 
     - Configuration eliminate any two hop cluster communication. EAP is context aware and send data to nodes where the data should sit (sharding etc)
 - 3 basic TCP communication. configured via the Datastores