Enterprise Framework

PROBLEM:  ElasticSearch - POST JSON to Remove hits .total, .max_score, ._index, ._type, _id, ._score

I have to be honest, this one really upset and frustrated me because I couldn't find an easy solution/answer using Google or ElasticSearch Documentation on how to only return back _source from a search POST json body.  When I finally figured it out, I think it wasn't implemented correctly. 

SOLUTION using QUERYSTRING:

First, off if you finally find in it in the ElasticSearch documentation, you can use the query string to remove extra metadata fields like _id, max_score, _index, _type, etc...  Correction, you can tell it which fields to include through a querystring:

GET /_search?q=elasticsearch&filter_path=took,hits.hits._id,hits.hits._score

reference:  https://www.elastic.co/guide/en/elasticsearch/reference/5.6/common-options.html

You can see from the example that you need to set the filter_path and pass in the fields you want returned back.

HOWEVER!!!!, if you are using the ElasticSearch-JS client for Node/browser, it doesn't really tell you how to do it in the API examples or in a POST json body example.

If this is documented, I sure as heck couldn't find it.

THE POST BODY SOLUTION

I'm going to tell you how to do it and there is a bug.

This is the normal client json request

            this.client.search({
                index: index,
                type: type,
                from: (page - 1) * pageSize,
                size: pageSize,
                body: body
            })

            this.client.search({
                index: index,
                type: type,
                from: (page - 1) * pageSize,
                size: pageSize,
                body: body,
                filter_path: [
                    'hits.total,hits.max_score,hits.hits._id,hits.hits._score,hits.hits._source'                    
                ]
            })