I've created an example project showing a proxy server to Elasticsearch
using Finagle https://github.com/twitter/finagle (scala/Java).
You can check out the code here: https://github.com/rore/finagle-es-proxy
The project demonstrates two interesting things:
- Using the native Java client inside the proxy. Using the native
client makes the proxy cluster aware and eliminates the need for an
additional round trip.
(It also demonstrates how to do a simple HTTP proxy, but that is
trivial. Using the native client requires a small hack - you need to pass
the request to the REST controller of Elasticsearch, provide it with a mock
channel to capture the response and return it in through the proxy.)
- Creating an authorization filter as part of the finagle service
chain. This allows the proxy to function as an authentication layer in
front of Elasticsearch for securing it.
Since the proxy uses the native client, using it as an authentication
layer has a minimal overhead.
Hope you find it useful.
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