ElasticSearch6 IK 同义词配置

网上大多数都是 es5 的配置方法，关于 es6 的同义词配置断断续续研究了好几天，今天本地服务器上，终于配成功了，记录一下！

1. 创建一个索引

curl -v -X PUT localhost:9200/station_index

2. close index，因为我们接下来要对该索引设置

curl -XPOST 'localhost:9200/station_index/_close'

3. 配置ik同义词

curl -l -H "Content-Type:application/json" -H "Accept:application/json" -X PUT 'http://localhost:9200/station_index/_settings?preserve_existing=true' -d '{
  "index.analysis.analyzer.ik_syno.filter" : [
    "my_synonym_filter"
  ],
  "index.analysis.analyzer.ik_syno.tokenizer" : "ik_max_word",
  "index.analysis.analyzer.ik_syno.type" : "custom",
  "index.analysis.analyzer.ik_syno_smart.filter" : [
    "my_synonym_filter"
  ],
  "index.analysis.analyzer.ik_syno_smart.tokenizer" : "ik_smart",
  "index.analysis.analyzer.ik_syno_smart.type" : "custom",
  "index.analysis.filter.my_synonym_filter.synonyms_path" : "synonyms.txt",
  "index.analysis.filter.my_synonym_filter.type" : "synonym"
}'

如 synonyms.txt 发生变动，重启 es 服务器即可生效

我遇到的问题：
问题1：这里说一下，网上很多博客修改 elasticsearch.yml 的做法，在 es6 中无法使用，例如：

es 服务器告诉我，自从5.x 以后他们就不让这么做啦，只能通过访问 API 来设置，好吧，我直接复制改一下索引搞定

问题2："type":"malformed_input_exception","reason":"Input length = 1"
详细信息如下

{"error":{"root_cause":[{"type":"illegal_argument_exception","reason":"failed to build synonyms"}],
"type":"illegal_argument_exception","reason":"failed to build synonyms",
"caused_by":{"type":"malformed_input_exception","reason":"Input length = 1"}},"status":400}

原因：这个问题是由于 synonyms.txt 解析错误造成
1）检查你的语法配置是否如下

程王, 程王线 => 程王

2）编码 UTF-8 （很关键！！！我就是被坑在这里）

4. open index

curl -XPOST 'localhost:9200/station_index/_open'

5. 测试

curl -l -H "Content-Type:application/json" -H "Accept:application/json" -X POST 'http://localhost:9200/station_index/_analyze' -d '{
  "analyzer" : "ik_syno_smart",
  "text" : "程王线"
}'

到这里已经大功告成了！

下面再把我的映射贴出来，有需要的可以参考

curl -l -H "Content-Type:application/json" -H "Accept:application/json" -X POST 'localhost:9200/station_index/station/_mapping' -d '{
    "properties": {
        "name": {
            "type": "text",
            "analyzer": "ik_syno_smart",
            "search_analyzer": "ik_syno_smart"
        }
    }
}'

ElasticSearch6 IK 同义词 配置