Completion suggester score for prefix search

Elastic Stack Elasticsearch
1

I am trying to understand how the score works for completion suggester. When I tested with the prefix search, the score always returns 1.0.

Below is my testing:
1): Create one index with suggest field:

PUT testidx
{
    "mappings": {
        "word" : {
            "properties" : {
                "suggest" : {
                    "type" : "completion"
                }
            }
        }
    }
}

2): Index three documents:

PUT testidx/word/1?refresh
{
    "suggest" : {
        "input": [ "complementary", "come" ]
    }
}

PUT testidx/word/2?refresh
{
    "suggest" : {
        "input": [ "complementary"]
    }
}

PUT testidx/word/3?refresh
{
    "suggest" : {
        "input": [ "complementary", "compile"]
    }
}

3): Execute the suggest search:

POST testidx/_search
{
    "suggest": {
        "word-suggest" : {
            "prefix" : "com",
            "completion" : {
                "field" : "suggest"
            }
        }
    }
}

And below is the result:

{
    "took": 58,
    "timed_out": false,
    "_shards": {
        "total": 1,
        "successful": 1,
        "failed": 0
    },
    "hits": {
        "total": 0,
        "max_score": 0,
        "hits": []
    },
    "suggest": {
        "word-suggest": [
            {
                "text": "com",
                "offset": 0,
                "length": 3,
                "options": [
                    {
                        "text": "come",
                        "_index": "testidx",
                        "_type": "word",
                        "_id": "1",
                        "_score": 1,
                        "_source": {
                            "suggest": {
                                "input": [
                                    "complementary",
                                    "come"
                                ]
                            }
                        }
                    },
                    {
                        "text": "compile",
                        "_index": "testidx",
                        "_type": "word",
                        "_id": "3",
                        "_score": 1,
                        "_source": {
                            "suggest": {
                                "input": [
                                    "complementary",
                                    "compile"
                                ]
                            }
                        }
                    },
                    {
                        "text": "complementary",
                        "_index": "testidx",
                        "_type": "word",
                        "_id": "2",
                        "_score": 1,
                        "_source": {
                            "suggest": {
                                "input": [
                                    "complementary"
                                ]
                            }
                        }
                    }
                ]
            }
        ]
    }
}

I am supposed the word "complementary" has higher score since there has more appearances for it, but it comes the same score with the "come" word. Could you please explain it? Thanks!

2

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