Write Kubernetes configuration file for deploying Kosh

[dennyabrain]

Background context to the discussion can be found here - #8 (comment)

For this scope, lets focus on deploying the following on kubernetes :
For the current version :
1 : elasticsearch : to store and retrieve vectors and full text search
2 : rabbitmq : for queues
3 : flask server which expose certain ML features : this can be large (1-2 GBs) in terms of memory depending on the ML model loaded
4 : nodejs server : basic REST api, nothing special here.

[dennyabrain]

Some investigations need to be done on what are the best practices to run elasticsearch on kubernetes. Although elasticsearch requires running 3 nodes in production, I'd like to know if it can be run on a single node to begin with and scale the replica count up later as and when needed.