Is anyone can give practices about ES running on 17TB code search in github?

I searched ES applications from internet and got this,

Open source clustered Lucene: elasticsearch used by GitHub (17 TB code)

Also i found StumbleUpon is using elastic search above HBase.

Could anyone can share some practical experience on ES in large-scale?

We hope to use it on 1 billion documents.

Any discussion/ facts / experience will be appreicated.

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