## 一、索引的維護 如果建立的檢索數據模型發生變更，需要強制的刪除一次索引，然后重建之，否則，索引不會被更新，舉例； ``` GET /rayphonenumber/_mapping?pretty ``` 結果： ``` { "rayphonenumber" : { "mappings" : { "properties" : { "_class" : { "type" : "keyword", "index" : false, "doc_values" : false }, "area" : { "type" : "keyword" }, "full-number" : { "type" : "text", "fields" : { "keyword" : { "type" : "keyword", "ignore_above" : 256 } } }, "id" : { "type" : "text", "fields" : { "keyword" : { "type" : "keyword", "ignore_above" : 256 } } }, "number" : { "type" : "keyword" }, "price" : { "type" : "long" }, "service-provider" : { "type" : "keyword" }, "sku-id" : { "type" : "long" }, "spu-id" : { "type" : "long" } } } } } ``` 其中有些字段，是在后期增加和變化的，但索引并沒有隨著數據變化和自動更新，可以通過強制刪除索引，然后重建一次，來解決這個問題； ``` elasticsearchOperations.indexOps(PhoneNumber.class).delete() ``` 或者直接用命令： ``` DELETE /rayphonenumber ``` 然后，再重新導入數據，即可自動創建更新的索引； ``` { "rayphonenumber" : { "mappings" : { "properties" : { "_class" : { "type" : "keyword", "index" : false, "doc_values" : false }, "area" : { "type" : "text", "analyzer" : "ik_smart" }, "full-number" : { "type" : "keyword" }, "number" : { "type" : "text" }, "price" : { "type" : "long" }, "service-provider" : { "type" : "text", "analyzer" : "ik_smart" }, "sku-id" : { "type" : "long" }, "spu-id" : { "type" : "long" } } } } } ```