Java API for filter_path in elastic search

I need to reduce the response size of elastic search query, So I found one way to use Response Filtering through filter_path parameter in URL.

GET testindex-2016.04.14/_search?filter_path=aggregations.testAggs.buckets 

Below is the link:

But I couldn't find any way to implement response filtering in Java API,
While googling, I have also seen one class in elastic search, but I couldn't find any example of it. Even I am not sure whether this class can be used for this purpose or not.

Please suggest me any way to implement response filtering in Java. Thanks

The Transport Client can not do that. It's done on a REST level.

It's done here:

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