Elasticsearch 5.0 explain exlain detail

Elastic Stack Elasticsearch
1

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?

2

We should really improve this. For now you can read a lot on wikipedia.

3

I filed