首页 > 其他分享 >08-基于词项和基于全文的搜索

08-基于词项和基于全文的搜索

时间:2024-09-04 10:51:57浏览次数:12  
标签:基于 -# 08 search products groups query POST 词项

DELETE products

PUT products
{
  "settings": {
    "number_of_shards": 1
  }
}


POST /products/_bulk
{ "index": { "_id": 1 }}
{ "productID" : "XHDK-A-1293-#fJ3","desc":"iPhone" }
{ "index": { "_id": 2 }}
{ "productID" : "KDKE-B-9947-#kL5","desc":"iPad" }
{ "index": { "_id": 3 }}
{ "productID" : "JODL-X-1937-#pV7","desc":"MBP" }

GET /products

# iPhone 查询不到,iphone可以查询
POST /products/_search
{
  "query": {
    "term": {
      "desc": {
        //"value": "iPhone"
        "value":"iphone"
      }
    }
  }
}

# keyword iPhone可以查询,iphone查询不到
POST /products/_search
{
  "query": {
    "term": {
      "desc.keyword": {
        "value": "iPhone"
        //"value":"iphone"
      }
    }
  }
}


# 查询不到
POST /products/_search
{
  "query": {
    "term": {
      "productID": {
        "value": "XHDK-A-1293-#fJ3"
      }
    }
  }
}

# keyword 可以查询
# explain 查询的详细解释
POST /products/_search
{
  //"explain": true,
  "query": {
    "term": {
      "productID.keyword": {
        "value": "XHDK-A-1293-#fJ3"
      }
    }
  }
}

# constant_score 不考虑文档得分的情况下执行一个查询
POST /products/_search
{
  "explain": true,
  "query": {
    "constant_score": {
      "filter": {
        "term": {
          "productID.keyword": "XHDK-A-1293-#fJ3"
        }
      }
    }
  }
}

DELETE products

DELETE groups

# 设置 position_increment_gap
# position_increment_gap 是 Elasticsearch 中映射字段属性的一部分,用于控制文本字段中词项之间的位置增量。位置增量是指在全文搜索中词项之间的距禋。

# 主要使用场景:
# Phrase Searching: 在执行短语搜索时,位置增量可以影响词项匹配的准确性。通过调整 position_increment_gap,您可以控制 Elasticsearch 是否将字段值中相邻的词项视为一个短语。
# Synonym Analysis: 当处理同义词时,有时希望多个同义词共享相同的位置增量,以便它们被视为等效的词项。
# Token Filter Behavior: 位置增量还可以影响分析器和令牌过滤器的行为,例如在构建搜索引擎时控制关键字的匹配方式。

PUT groups
{
  "mappings": {
    "properties": {
      "names":{
        "type": "text",
        "position_increment_gap": 0
      }
    }
  }
}

GET groups/_mapping

POST groups/_doc
{
  "names": [ "John Water", "Water Smith"]
}

POST groups/_search
{
  "query": {
    "match_phrase": {
      "names": {
        "query": "Water Water",
        "slop": 100
      }
    }
  }
}


POST groups/_search
{
  "query": {
    "match_phrase": {
      "names": "Water Smith"
    }
  }
}

DELETE groups

标签:基于,-#,08,search,products,groups,query,POST,词项
From: https://blog.csdn.net/zhouweiye2012/article/details/141887819

相关文章