source filtering and filter_path

source filtering and filter path examples

"If you want to filter _source fields, you should consider combining the already existing _source parameter (see Get API for more details) with the filter_path parameter"


Response Filtering (filter_path):
https://www.elastic.co/guide/en/elasticsearch/reference/current/common-options.html#common-options-response-filtering

Source Filtering:
https://www.elastic.co/guide/en/elasticsearch/reference/current/docs-get.html#get-source-filtering


GET /birthday/_search

{
  "took": 1,
  "timed_out": false,
  "_shards": {
    "total": 5,
    "successful": 5,
    "failed": 0
  },
  "hits": {
    "total": 1,
    "max_score": 1,
    "hits": [
      {
        "_index": "birthday",
        "_type": "t",
        "_id": "1",
        "_score": 1,
        "_source": {
          "birthday": "1974-05-04",
          "first_name": "foo",
          "last_name": "bar",
          "hobby": "baz"
        }
      }
    ]
  }
}

# using both filter_path and source filtering 
GET /birthday/_search?_source_include=birthday&filter_path=hits.hits._source

{
  "hits": {
    "hits": [
      {
        "_source": {
          "birthday": "1974-05-04"
        }
      }
    ]
  }
}

# using only filter_path and without source filtering
GET /birthday/_search?filter_path=hits.hits._source.birthday

{
  "hits": {
    "hits": [
      {
        "_source": {
          "birthday": "1974-05-04"
        }
      }
    ]
  }
}