CODEWITHSUNDEEP
elasticsearch
Vishakha Lall
Vishakha Lall

Reputation: 1314

Not getting the explanation result on running Explain API in ES

I'm using ES version 7.9.2 and trying to run the Explain API but the response does not return any explanation result, what could be the reason?

Here's the curl I tried

curl -X GET \
  'http://localhost:9200/test/default/_search?explain=' \
  -H 'Content-Type: application/json' \
  -H 'Postman-Token: 1bd83933-74cd-465d-87da-65bba4efcaad' \
  -H 'cache-control: no-cache' \
  -d '{
    "from": 0,
    "size": 10000,
    "query": {
        "bool": {
            "must": [
                {
                    "range": {
                        "data.createdAtEpoch": {
                            "from": 1589740200000,
                            "to": 1621318182305,
                            "include_lower": true,
                            "include_upper": true,
                            "boost": 1
                        }
                    }
                },
                {
                    "bool": {
                        "must": [
                            {
                                "terms": {
                                    "data.A": [
                                        "testA"
                                    ],
                                    "boost": 1
                                }
                            },
                            {
                                "terms": {
                                    "data.B": [
                                        "testB1",
                                        "testB2",
                                        "testB3"
                                    ],
                                    "boost": 1
                                }
                            }
                        ],
                        "adjust_pure_negative": true,
                        "boost": 1
                    }
                }
            ],
            "adjust_pure_negative": true,
            "boost": 1
        }
    },
    "version": true,
    "aggregations": {
        "data.payload.C": {
            "terms": {
                "field": "data.payload.C",
                "size": 300000,
                "min_doc_count": 1,
                "shard_min_doc_count": 0,
                "show_term_doc_count_error": false,
                "order": [
                    {
                        "_count": "desc"
                    },
                    {
                        "_key": "asc"
                    }
                ]
            }
        }
    }
}'

I've also tried passing "explain":true in the body and the approach here https://www.elastic.co/guide/en/elasticsearch/reference/current/search-explain.html. However, I get only the following result:

{
    "took": 2,
    "timed_out": false,
    "_shards": {
        "total": 1,
        "successful": 1,
        "skipped": 0,
        "failed": 0
    },
    "hits": {
        "total": {
            "value": 0,
            "relation": "eq"
        },
        "max_score": null,
        "hits": []
    },
    "aggregations": {
        "data.payload.C": {
            "doc_count_error_upper_bound": 0,
            "sum_other_doc_count": 0,
            "buckets": []
        }
    }
}

There is no explanation. What am I doing wrong?

Upvotes: 0

Views: 492

Answers (1)

Bhavya
Bhavya

Reputation: 16172

In the first case, you can use

GET /<index-name/_explain/<id>

This will return "matched": false in the search result, if the document having id did not match with the query. And if the document matches, then the score explanation (for that matched document) will come in the result.

In the second case, When you are using explain=true, this should return the explanation of the score of all the matching documents. But, you are not getting any matched results (as the hits[] array is empty), I think that none of the documents has matched your query due to which explain API also didn't return any result.

Upvotes: 1

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