Mapper-attachment plugin

Hello, I'm working on a Java project using spring framework and I have to use elasticsearch to index some documents (pdf, doc ..). I found that mapper-attachment plugin provides a new type 'attachment' which helps in my case.
The problem is that I haven't found some clear documentation for this plugin to make it work with elasticsearch 2.4.
Any help is much appreciated

In case you missed the page:

But I am using elasticsearch v 2.4.0.
Is there any suggestion ?

Yes. ingest-attachment as written in the image I pasted.

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