正则表达式与弹性搜索

Question

GET apple/company/_search
{
  "query": {
    "prefix": {
      "name": "a"
    }
  },
  "fields": [
    "id",
    "name",
    "websiteUrl"
  ],
  "size": 100
}

GET apple/company/_search
{
  "query": {
    "regexp": {
      "name": "^[\S]a*"
    }
  },
  "fields": [
    "id",
    "name",
    "websiteUrl"
  ],
  "size": 100
}

Answer 1

在Elasticsearch中进行搜索既是关于查询本身，也是关于数据的建模，以便它最适合要使用的查询。人们不能简单地索引任何东西，然后努力想出一个执行某些操作的查询。

查询的Elasticsearch方式是为该字段提供以下映射：

PUT /apple
{
  "settings": {
    "index": {
      "analysis": {
        "analyzer": {
          "keyword_lowercase": {
            "type": "custom",
            "tokenizer": "keyword",
            "filter": [
              "lowercase"
            ]
          }
        }
      }
    }
  },
  "mappings": {
    "company": {
      "properties": {
        "name": {
          "type": "string",
          "fields": {
            "analyzed_lowercase": {
              "type": "string",
              "analyzer": "keyword_lowercase"
            }
          }
        }
      }
    }
  }
}

并使用此查询：

GET /apple/company/_search
{
  "query": {
    "prefix": {
      "name.analyzed_lowercase": {
        "value": "a"
      }
    }
  }
}

GET /apple/company/_search
{
  "query": {
    "query_string": {
      "query": "name.analyzed_lowercase:A*"
    }
  }
}