如何獲取elasticsearch中的所有字段

Question

如何使用elastic4s獲取_source下的所有字段名稱（不是值）？我想要一個所有映射字段的列表。 我試圖做這樣的事情：

search in indexName/indexType sourceInclude "_source" limit q.limit aggregations(
       aggregation terms "agg0" field "_field_names" size 0 

      ) 

甚至

search in indexName/indexType sourceInclude "_source" sourceExclude ("_all", "_type", 
       "_uid", "_version", "_index", "_score", "_id") limit q.limit aggregations(
       aggregation terms "agg0" field "_field_names" size 0 

      ) 

，但沒有做到這一點。我把所有元數據字段，而不僅僅是那些在_source

"aggregations" : { 
    "agg0" : { 
     "doc_count_error_upper_bound" : 0, 
     "sum_other_doc_count" : 0, 
     "buckets" : [ { 
     "key" : "_all", 
     "doc_count" : 1500 
     }, { 
     "key" : "_source", 
     "doc_count" : 1500 
     }, { 
     "key" : "_type", 
     "doc_count" : 1500 
     }, { 
     "key" : "_uid", 
     "doc_count" : 1500 
     }, { 
     "key" : "_version", 
     "doc_count" : 1500 
     } 
.. more fields 

====更新===

我發現這種方式：

val map = getMapping indexName /indexType} 
val y = map.get("properties").asInstanceOf[java.util.Map[String, _]] 
y.keys.toList 

有沒有更好的方法得到相同的結果？

Answer 1

使用獲取映射API

GET /index/_mapping 
GET /index/_mapping/type 

https://www.elastic.co/guide/en/elasticsearch/reference/current/indices-get-mapping.html

或使用羣集API

GET /_cluster/state 

字段列表：

json -> metadata -> indices -> your_index -> mapping