三层关系编码

• 设置setting

  PUT last_tree_index
  {
    "settings": {
      "analysis": {
        "filter": {   # filter过滤器设置
          "edge_ngram_filter":{
            "type":"edge_ngram",
            "min_gram":1,
            "max_gram":50
          },
          "pinyin_simple_filter":{
            "type":"pinyin",
            "keep_first_letter":true,
            "keep_separate_first_letter":false,
            "keep_full_pinyin":false,
            "keep_original":false,
            "limit_first_letter_length":50,
            "lowercase":true
          },
          "pinyin_full_filter":{
            "type":"pinyin",
            "keep_first_letter":false,
            "keep_separate_first_letter":false,
            "keep_full_pinyin":true,
            "none_chinese_pinyin_tokenize":true,
            "keep_original":false,
            "limit_first_letter_length":50,
            "lowercase":true
          }
        },
        "tokenizer": {  # tokenizer 分词器设置
          "ik_max_word":{
            "type":"ik_max_word",
            "use_smart":true
          }
        },
        "analyzer": {  #analyzer 分析器设置
          "ngramIndexAnalyzer":{
            "type":"custom",
            "tokenizer":"keyword",
            "filter":[
              "edge_ngram_filter",
              "lowercase"
              ]
          },
          "ikIndexAnalyzer":{
            "type":"custom",
            "tokenizer":"ik_max_word"
          },
          "pinyiSimpleIndexAnalyzer":{
            "tokenizer":"keyword",
            "filter":[
              "pinyin_simple_filter",
              "edge_ngram_filter",
              "lowercase"
              ]
          },
          "pinyiFullIndexAnalyzer":{
            "tokenizer":"keyword",
            "filter":[
              "pinyin_full_filter",
              "lowercase"
              ]
          }
        }
      }
    }
  }
  

• 设置mapping

  PUT last_tree_index/_mapping/_doc
  {
    "properties":{
      "my_join_field":{
        "type":"join",
        "relations":{
          "question":"answer",
          "answer":"vote"
        }
      },
      "fullText":{
        "type":"text",
        "analyzer":"ikIndexAnalyzer",
        "fields":{
          "ngram":{
            "type":"text",
            "analyzer":"ngramIndexAnalyzer"
          },
          "SPY":{
            "type":"text",
            "analyzer":"pinyiSimpleIndexAnalyzer"
          },
          "FPY":{
            "type":"text",
            "analyzer":"pinyiFullIndexAnalyzer"
          }
        }
      }
    }
  }
  

• 插入数据

  PUT last_tree_index/_doc/1?refresh
  {
    "fullText":"这是一个问题",
    "my_join_field":"question"
  }
  
  PUT last_tree_index/_doc/2?refresh
  {
    "fullText":"这是另外一个问题",
    "my_join_field":"question"
  }
  
  PUT last_tree_index/_doc/3?routing=1&refresh
  {
    "fullText":"这是一个答案",
    "my_join_field":{
      "name":"answer",
      "parent":"1"
    }
  }
  
  PUT last_tree_index/_doc/4?routing=2&refresh
  {
    "fullText":"这是另外一个答案",
    "my_join_field":{
      "name":"answer",
      "parent":"2"
    }
  }
  
  PUT last_tree_index/_doc/5?routing=1&refresh
  {
    "fullText":"这是一个赞同",
    "my_join_field":{
      "name":"vote",
      "parent":"3"
    }
  }
  
  PUT last_tree_index/_doc/6?routing=2&refresh
  {
    "fullText":"这是另外一个赞同",
    "my_join_field":{
      "name":"vote",
      "parent":"4"
    }
  }
  

• 最终简单查询语句

  GET last_tree_index/_search
  {
    "query": {
      "bool": {
        "should": [
          {
            "match": {
              "fullText.ngram": {
                "query": "这是问题",
                "boost": 5 
              }
            }
          },
          {
            "match": { 
              "fullText.SPY": {
                "query": "zswt",
                "boost": 1 
              }
            }
          },
          {
            "match": { 
              "fullText.FPY": {
                "query": "zheshiwenti",
                "boost": 0.8
              }
            }
          }
        ],
        "must": [
          {
            "has_child": {
              "type": "answer",
              "query": {
                "has_child": {
                  "type": "vote",
                  "query": {
                    "bool": {
                      "should": [
                        {
                          "term": {
                            "fullText": "这是"
                          }
                        }
                      ]
                    }
                  }
                }
              },
              "inner_hits": {}
            }
          }
        ]
      }
    }
  }
  

• 多字段匹配改写

  GET last_tree_index/_search
  {
    "query": {
      "bool": {
        "should": [
          {
            "multi_match": {
              "query": "这是问题",
              "fields": ["fullText^10","fullText.ngram^5","fullText.SPY^1","fullText.FPY^0.8"]
            }
          }
        ],
        "must": [
          {
            "has_child": {
              "type": "answer",
              "query": {
                "has_child": {
                  "type": "vote",
                  "query": {
                    "bool": {
                      "should": [
                        {
                          "term": {
                            "fullText": "这是"
                          }
                        }
                      ]
                    }
                  }
                }
              },
              "inner_hits": {}
            }
          }
        ]
      }
    }
  }