嗨，有人能帮我理解elasticsearch如何评估标记的相关性吗？我有一个Map看起来像

{
    "settings": {
        "index": {
            "refresh_interval": "-1",
            "number_of_shards": "4",
            "analysis": {
                "filter": {
                    "stopwords_SK": {
                        "ignore_case": "true",
                        "type": "stop",
                        "stopwords_path": "stopwords/slovak.txt"
                    },
                    "autocomplete_filter": {
                        "type": "edge_ngram",
                        "min_gram": "2",
                        "max_gram": "20"
                    }
                },
                "analyzer": {
                    "autocomplete": {
                        "filter": [
                            "stopwords_SK",
                            "lowercase",
                            "stopwords_SK",
                            "autocomplete_filter"
                        ],
                        "type": "custom",
                        "tokenizer": "standard"
                    }
                }
            },
            "number_of_replicas": "1"
        }
    },
    "mappings": {
        "doc": {
            "dynamic": "strict",
            "properties": {
                "nn": {
                    "type": "text",
                    "fielddata": true,
                    "fields": {
                        "raw": {
                            "type": "keyword"
                        }
                    },
                    "boost": 10,
                    "analyzer": "autocomplete"
                }
            }
        }
    }
}

nn字段通过标准标记化器进行标记化。下一个简单的查询运行良好，并返回相关结果，如“softone sro”、“softec sro”。。。

{
    "_source": [
        "nn", 
        "nazov"
    ],
    "size": 10,
    "query": {
        "bool": {
            "must": [
                {
                    "match": {
                        "nn": "softo"
                    }
                }
            ]
        }
    }
}

但是如果我需要在查询中添加should条件，它绝对不会返回任何相关的结果，并且缺少以前最相关的结果，如“sofone”或“softex”。它返回例如“zo soz kovo zts nova as zts elektronika as”或“agentura socialnych sluzieb ass no”。。。这里是应该查询

{
    "_source": [
        "nn",
        "nazov"
    ],
    "size": 10,
    "query": {
        "bool": {
            "must": [
                {
                    "match": {
                        "nn": "softo"
                    }
                }
            ],
            "should": [
                {
                    "match": {
                        "nn": "as"
                    }
                },
                {
                    "match": {
                        "nn": "sro"
                    }
                }
            ]
        }
    }
}

为什么查询结果会缺少第一次查询中最相关的“sofone”和“softex”项？我认为相关性是基于标记长度的，这意味着“sotf”标记比“so”标记更相关。谢谢。