elasticsearch学习之cross_fields字段使用

• cross_fields字段：在查询阶段解决信号冲突问题
• 问题： The cross_fields type is particularly useful with structured documents where multiple fields should match. For instance, when querying the first_name and last_name fields for “Will Smith”, the best match is likely to have “Will” in one field and “Smith” in the other.
• 解决：The cross_field type tries to solve these problems at query time by taking a term-centric approach. It first analyzes the query string into individual terms, then looks for each term in any of the fields, as though they were one big field.

GET _search
{
  "size": 20,
  "_source": "title",
  "explain": true, 
  "query": {
    "bool": {
      "should": [
        {
          "multi_match": {
            "query": "star trek patrick stewart",
            "fields": [
              "overview","title","directors.name","cast.name"],
              "type": "cross_fields"
          }
        },
        {"multi_match": {
          "query": "star trek patrick stewart",
          "fields": [
            "directors.name.bigramed","cast.name.bigramed"],
            "type": "cross_fields",
            "boost":100
        }}
      ]
    }
  }
}

GET _search
{
  "size": 10,
  "_source": "title",
  "explain": true, 
  "query":{
    "bool":{
      "should": [
        {
          "match_phrase": {
            "title_exact_match":{
              "query":"SENTINEL_BEGIN star trek SENTINEL_END",
              "boost":1000
          }
        }},
        {
          "multi_match": {
            "query": "star trek",
            "fields": [
              "overview","title","directors.name","cast.name"],
              "type": "cross_fields"
          }
        }
      ]
      
    }
  }
}

GET _search
{
  "size": 10,
  "_source": "title",
  "explain": true,
  "query": {
    "function_score": {
      "query": {
        "multi_match": {
          "query": "william shatner patrick stewart",
          "fields": [
            "overview",
            "title",
            "directors.name",
            "cast.name"
          ],
          "type": "cross_fields"
        }
      },
      "functions": [
        {
          "weight": 2.5,
          "filter": {
            "match_phrase": {
              "title": "star trek"
            }
          }
        }
      ]
    }
  }
}