Field_value_factor wrong depending on index

Elastic Stack Elasticsearch
1

Hello,

I have two similar documents in two different indices.
My score is correct in only one of them.

This is my document :

{
  "id": 1,
  "colors": {
    "colorA": {
      "hue": 50,
      "population": 0.5
    },
    "colorB": {
      "hue": 90,
      "population": 0.00003
    },
  }
}

I want to use population as the score when one color matches my query.

I'm using field_value_factor in my query like this :

{
  "query": {
    "nested": {
      "path": "colors",
      "query": {
        "function_score": {
          "query": {
            "match": {
              "colors.colorA.hue": 50
            }
          },
          "field_value_factor": {
            "field": "colors.colorA.population"
          },
          "boost_mode": "replace"
        }
      }
    }
  }
}

If I use the explain API on a "new" index I get the correct score of 0.5 :

"value": 0.5,
"description": "min of:",
"details": [
    {
      "value": 0.5,
      "description": "field value function: none(doc['colors.colorA.population'].value * factor=1.0)",
      "details": [ ]
    }, ...
]
...

But if I do the same on an index containing many other similar documents I get a wrong score of 0 :

"value": 0,
"description": "min of:",
"details": [
    {
      "value": 0,
      "description": "field value function: none(doc['colors.colorA.population'].value * factor=1.0)",
      "details": [ ]
    }, ...
]
...

Strangely, if I change the field to colorB.population

"field_value_factor": {
  "field": "colors.colorB.population"
},

I get the expected behaviour (score of 0.00003 ) :

"value": 0.00003,
"description": "min of:",
"details": [
    {
      "value": 0.00003,
      "description": "field value function: none(doc['colors.colorA.population'].value * factor=1.0)",
      "details": [ ]
    }, ...
]
...

I've made a lot of tries but I can't quite understand why is my score wrong when I use colors.colorA.population and not colors.colorB.population, and why is it working on a "new" index but not on another one ?

This issue seems related to mine: Field value factor ignoring fields with a value less than one
But I create my index I use the type nested for my colors array.

Thanks for your help

2

Hello,

I fixed it, by using a object datatype instead of nested, and by typing every properties of these object.

The issue was the same as the one described here :

3

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