# Elasticsearch 5.0 explain exlain detail

**URL:** <https://discuss.elastic.co/t/elasticsearch-5-0-explain-exlain-detail/64351>\
**Category:** Elasticsearch\
**Created:** [October 29, 2016, 6:11pm UTC](https://discuss.elastic.co/t/elasticsearch-5-0-explain-exlain-detail/64351 "2016-10-29T18:11:04Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![glagidse](https://avatars.discourse-cdn.com/v4/letter/g/b4bc9f/32.png) [@glagidse](https://discuss.elastic.co/u/glagidse)\
**Post date:** [October 29, 2016, 6:11pm UTC](https://discuss.elastic.co/t/elasticsearch-5-0-explain-exlain-detail/64351/1 "2016-10-29T18:11:04Z")

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[https://www.elastic.co/guide/en/elasticsearch/reference/current/search-explain.html](https://www.elastic.co/guide/en/elasticsearch/reference/current/search-explain.html)

Here these details are shown:

```
"details" : [
            { "value" : 1.0, "description" : "termFreq=1.0", "details" : [] },
            { "value" : 1.2, "description" : "parameter k1", "details" : [] },
            { "value" : 0.75, "description" : "parameter b", "details" : [] },
            { "value" : 5.4, "description" : "avgFieldLength", "details" : [] },
            { "value" : 4.0, "description" : "fieldLength", "details" : [] }
          ]

```

Where can I find out what each of these fields mean? In the documentation I can read about temFreq but what do the others do?

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<div class="post-metadata">

**Author:** ![nik9000](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/nik9000/32/44947_2.png) [@nik9000](https://discuss.elastic.co/u/nik9000)\
**Post date:** [October 30, 2016, 2:30am UTC](https://discuss.elastic.co/t/elasticsearch-5-0-explain-exlain-detail/64351/2 "2016-10-30T02:30:01Z")

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We should really improve this. For now you can read a lot on [wikipedia](https://en.wikipedia.org/wiki/Okapi_BM25).

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<div class="post-metadata">

**Author:** ![nik9000](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/nik9000/32/44947_2.png) [@nik9000](https://discuss.elastic.co/u/nik9000)\
**Post date:** [October 30, 2016, 2:32am UTC](https://discuss.elastic.co/t/elasticsearch-5-0-explain-exlain-detail/64351/3 "2016-10-30T02:32:08Z")

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I filed

> <https://github.com/elastic/elasticsearch/issues/21186>

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [July 5, 2017, 10:08pm UTC](https://discuss.elastic.co/t/elasticsearch-5-0-explain-exlain-detail/64351/4 "2017-07-05T22:08:34Z")

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Closed on July 5, 2017, 10:08pm UTC