Packer: How to Build a Golden Image behind Corporate Proxy

Packer is a powerful tool to build a golden image for multiple platforms. All the configurations are scripted therefore you can embrace Infrastructure-as-a-Code practice. And the best thing, it is FREE!

Filtering Nested Array Objects in Elasticsearch Document with Painless Scripting

Painless is a simple, secure scripting language designed specifically for use with Elasticsearch. It is the default scripting language for Elasticsearch and can safely be used for inline and stored scripts.