ElasticSearch 实现即使搜索

1. 对于电话号码，邮编这种字段，可以把字段设置位keyword，然后搜索的时候用 prefix query，match_phrase_prefix query进行查询
2. 对于数字字母汉字组合这种比较长的语句，比如有个字段叫title，内容如下“network学习专区”，如果希望搜索“net”能查到，搜索“专区”也能查到，就有2种方法： 方法1：把这个语句存2分，一份为keyword类型，一份为text类型，当需要即时搜索的时候，就去查keyword，需要模糊搜索的时候就去查text。 方法2：自定义分词器 在索引的settings里设置如下：

"analysis": {
                "filter": {
                    "my_autocomplete_filter": {
                        "type": "edge_ngram",
                        "min_gram": 1,
                        "max_gram": 10
                    }
                },
                "analyzer": {
                    "my_autocomplete_analyzer": {
                        "type": "custom",
                        "tokenizer": "standard",
                        "filter": [
                           "lowercase",
                           "my_autocomplete_filter"
                        ]
                    }
                }
            }

然后mappings里指定字段的分词器为my_autocomplete_analyzer：

title : {     
                    type : text，
                    analyzer : my_autocomplete_analyzer           
    }

可以测试分词结果，执行 curl -H “Content-Type: application/json” -XPOST “http://127.0.0.1:9200/myindex/_analyze?pretty” -d ’ {“text”: “network专区”, “analyzer”: “my_autocomplete_analyzer”}’

结果如下：

{
  "tokens" : [
    {
      "token" : "n",
      "start_offset" : 0,
      "end_offset" : 7,
      "type" : "<ALPHANUM>",
      "position" : 0
    },
    {
      "token" : "ne",
      "start_offset" : 0,
      "end_offset" : 7,
      "type" : "<ALPHANUM>",
      "position" : 0
    },
    {
      "token" : "net",
      "start_offset" : 0,
      "end_offset" : 7,
      "type" : "<ALPHANUM>",
      "position" : 0
    },
    {
      "token" : "netw",
      "start_offset" : 0,
      "end_offset" : 7,
      "type" : "<ALPHANUM>",
      "position" : 0
    },
    {
      "token" : "netwo",
      "start_offset" : 0,
      "end_offset" : 7,
      "type" : "<ALPHANUM>",
      "position" : 0
    },
    {
      "token" : "networ",
      "start_offset" : 0,
      "start_offset" : 0,
      "end_offset" : 7,
      "type" : "<ALPHANUM>",
      "position" : 0
    },
    {
      "token" : "network",
      "start_offset" : 0,
      "end_offset" : 7,
      "type" : "<ALPHANUM>",
      "position" : 0
    },
    {
      "token" : "专",
      "start_offset" : 7,
      "end_offset" : 8,
      "type" : "<IDEOGRAPHIC>",
      "position" : 1
    },
    {
      "token" : "区",
      "start_offset" : 8,
      "end_offset" : 9,
      "type" : "<IDEOGRAPHIC>",
      "position" : 2
    }
  ]
}