（二）Elasticsearch 分词

analyzer

1. 默认standard

   • 内置的分析器有whitespace 、 simple和english

   GET /_analyze
   {
     "analyzer": "standard",
     "text":"司马南手撕联想集团倒拔垂杨柳"
   }
   #2去除非字母，转小写
   POST /_analyze
   {
     "analyzer": "simple",
     "text":"2 running Quick Brown-foxes"
   }
   #3按空格切分
   {
     "analyzer": "whitespace",
     "text":"2 running Quick Brown-foxes"
   }
   #4 比simple多去除is the 等修饰词
   POST /_analyze
   {
     "analyzer": "stop",
     "text":"2 running Quick Brown-foxes in the summer"
   }
   #5不分词
   POST /_analyze
   {
     "analyzer": "keyword",
     "text":"2 running Quick Brown-foxes in the summer"
   }
   #针对不同的语言
   GET /_analyze
   {
     "analyzer": "english",
     "text":"2 running Quick Brown-foxes in the summer"
   }
   

2. ik分词器

   GET /_analyze
   {
     "analyzer": "ik_max_word",
     "text":"司马南手撕联想集团杨柳"
   }
   

   • ik_max_word：会将文本做最细粒度的拆分
   • ik_smart：会做最粗粒度的拆分；已被分出的词语将不会再次被其它词语占有