elasticsearch 弹性搜索中的LM

我如何提高这种情况下的召回率？有什么建议吗？ 我想创建一个包含3900万段的索引，每段至少包含四个英语句子。我的问题是简短的疑问句。我知道，使用Dirichlet平滑、停止字删除和词干分析器的语言模型最适合这种情况。如何使用这些条件编制索引（我已经使用此配置编制了索引，但与默认bm25的结果没有差异）

我的索引：

{
"settings": {
"index":{
            "similarity" : {
          "my_similarity" : {
            "type" : "LMDirichlet",
            "mu" : 2000
          }
        },
  "analysis":{
    "filter":{
      "english_stop":{
        "type":"stop",
        "stopwords":"_english_"
      },
      "my_stemmer":{
        "type":"stemmer",
        "name":"english"
      }
    },
    "analyzer":{
      "my_custom_analyzer":{
        "type":"custom",
        "tokenizer":"standard",
        "filter":[
          "lowercase",
          "english_stop",
          "my_stemmer"
          ]
      }
    }
  }
},
    "number_of_shards": 1
},
"mappings": {
    "properties": {
        "content": {
        "similarity" : "my_similarity" ,
        "analyzer": "my_custom_analyzer",
            "type": "text"
        }
    }
}
}

query = " (" + prevTurn + ")^1 (" + currentTurn + ")^2"

search_param={
"query": {
"query_string": {
"query":query,
"analyzer": "my_stop_analyzer",
"default_field":"doc.content"
}
}
}

Title: The Neolithic Revolution
Description: The neolithic revolution and technology used within it and when it emerged in the british isles.  Also, the transition to the bronze age and its significance.
1   What was the neolithic revolution?
2   When did it start and end?
3   Why did it start?
4   What did the neolithic invent?
5   What tools were used?
6   When was it brought to the british isles?

搜索我的python代码的方法是：

{
"settings": {
"index":{
            "similarity" : {
          "my_similarity" : {
            "type" : "LMDirichlet",
            "mu" : 2000
          }
        },
  "analysis":{
    "filter":{
      "english_stop":{
        "type":"stop",
        "stopwords":"_english_"
      },
      "my_stemmer":{
        "type":"stemmer",
        "name":"english"
      }
    },
    "analyzer":{
      "my_custom_analyzer":{
        "type":"custom",
        "tokenizer":"standard",
        "filter":[
          "lowercase",
          "english_stop",
          "my_stemmer"
          ]
      }
    }
  }
},
    "number_of_shards": 1
},
"mappings": {
    "properties": {
        "content": {
        "similarity" : "my_similarity" ,
        "analyzer": "my_custom_analyzer",
            "type": "text"
        }
    }
}
}

query = " (" + prevTurn + ")^1 (" + currentTurn + ")^2"

search_param={
"query": {
"query_string": {
"query":query,
"analyzer": "my_stop_analyzer",
"default_field":"doc.content"
}
}
}

Title: The Neolithic Revolution
Description: The neolithic revolution and technology used within it and when it emerged in the british isles.  Also, the transition to the bronze age and its significance.
1   What was the neolithic revolution?
2   When did it start and end?
3   Why did it start?
4   What did the neolithic invent?
5   What tools were used?
6   When was it brought to the british isles?

一个示例回合：

{
"settings": {
"index":{
            "similarity" : {
          "my_similarity" : {
            "type" : "LMDirichlet",
            "mu" : 2000
          }
        },
  "analysis":{
    "filter":{
      "english_stop":{
        "type":"stop",
        "stopwords":"_english_"
      },
      "my_stemmer":{
        "type":"stemmer",
        "name":"english"
      }
    },
    "analyzer":{
      "my_custom_analyzer":{
        "type":"custom",
        "tokenizer":"standard",
        "filter":[
          "lowercase",
          "english_stop",
          "my_stemmer"
          ]
      }
    }
  }
},
    "number_of_shards": 1
},
"mappings": {
    "properties": {
        "content": {
        "similarity" : "my_similarity" ,
        "analyzer": "my_custom_analyzer",
            "type": "text"
        }
    }
}
}

query = " (" + prevTurn + ")^1 (" + currentTurn + ")^2"

search_param={
"query": {
"query_string": {
"query":query,
"analyzer": "my_stop_analyzer",
"default_field":"doc.content"
}
}
}

Title: The Neolithic Revolution
Description: The neolithic revolution and technology used within it and when it emerged in the british isles.  Also, the transition to the bronze age and its significance.
1   What was the neolithic revolution?
2   When did it start and end?
3   Why did it start?
4   What did the neolithic invent?
5   What tools were used?
6   When was it brought to the british isles?

---

您可以在查询中尝试相似性