Elasticsearch根据输入内容给出自动建议和自动补全

墨蓝 2023-01-15 03:56 143阅读 0赞

自动建议：包括按词项给出建议和按语句给出建议，按词项给出建议包括三种类型：missing 当搜索内容不存在给出建议；popular 建议文档出现的频率比搜索内容高的词；always 总是给出建议。

自动补全：需要提前在Mapping设置字段类型为completion，根据搜索的内容给出自动补全信息。

1 按词项给出建议

# 按每个词项给出查询建议 text会被分词，每个词项，当搜索内容不存在时给出建议
    POST /nba_latest/_search
    {
      "suggest": {
        "my-suggestion": {
          "text": "jamse hardne",
          "term": {
            "suggest_mode": "popular",
            "field": "displayNameEn"
          }
        }
      }
    }

{
      "took" : 4,
      "timed_out" : false,
      "_shards" : {
        "total" : 1,
        "successful" : 1,
        "skipped" : 0,
        "failed" : 0
      },
      "hits" : {
        "total" : {
          "value" : 0,
          "relation" : "eq"
        },
        "max_score" : null,
        "hits" : [ ]
      },
      "suggest" : {
        "my-suggestion" : [
          {
            "text" : "jamse",
            "offset" : 0,
            "length" : 5,
            "options" : [
              {
                "text" : "james",
                "score" : 0.8,
                "freq" : 5
              },
              {
                "text" : "jamal",
                "score" : 0.6,
                "freq" : 2
              },
              {
                "text" : "jake",
                "score" : 0.5,
                "freq" : 1
              },
              {
                "text" : "jose",
                "score" : 0.5,
                "freq" : 1
              }
            ]
          },
          {
            "text" : "hardne",
            "offset" : 6,
            "length" : 6,
            "options" : [
              {
                "text" : "harden",
                "score" : 0.8333333,
                "freq" : 1
              }
            ]
          }
        ]
      }
    }

2 按语句给出建议

# 按语句给出查询建议 
    POST /nba_latest/_search
    {
      "suggest": {
        "my-suggestion": {
          "text": "james harden1",
          "phrase": {
            "field": "displayNameEn"
          }
        }
      }
    }

{
      "took" : 3,
      "timed_out" : false,
      "_shards" : {
        "total" : 1,
        "successful" : 1,
        "skipped" : 0,
        "failed" : 0
      },
      "hits" : {
        "total" : {
          "value" : 0,
          "relation" : "eq"
        },
        "max_score" : null,
        "hits" : [ ]
      },
      "suggest" : {
        "my-suggestion" : [
          {
            "text" : "james harden1",
            "offset" : 0,
            "length" : 13,
            "options" : [
              {
                "text" : "james harden",
                "score" : 0.0035323775
              }
            ]
          }
        ]
      }
    }

3 补全信息

# 需要在mapping预先设置字段的类型为completion才生效，根据输入的内容 给出自动补全信息
    POST /nba_latest/_search
    {
      "suggest": {
        "my-suggestion": {
          "text": "Miam",
          "completion": {
            "field": "teamCityEn"
          }
        }
      }
    }