Low level client for Elasticsearch. It's goal is to provide common ground
for all Elasticsearch-related code in Python. The client's features include:

- Translating basic Python data types to and from json
- Configurable automatic discovery of cluster nodes
- Persistent connections
- Load balancing (with pluggable selection strategy) across all available nodes
- Failed connection penalization (time based - failed connections won't be
retried until a timeout is reached)
- Thread safety
- Pluggable architecture