使用elasticsearch做分页查询时，当查询记录超过10000时，会报如下错误：

Caused by: org.elasticsearch.search.query.QueryPhaseExecutionException: Result window is too large, from + size must be less than or equal to: [10000] but was [17500000]. See the scroll api for a more efficient way to request large data sets. This limit can be set by changing the [index.max_result_window] index level setting.
	at org.elasticsearch.search.DefaultSearchContext.preProcess(DefaultSearchContext.java:203) ~[elasticsearch-5.6.13.jar:5.6.13]
	at org.elasticsearch.search.query.QueryPhase.preProcess(QueryPhase.java:90) ~[elasticsearch-5.6.13.jar:5.6.13]
	at org.elasticsearch.search.SearchService.createContext(SearchService.java:493) ~[elasticsearch-5.6.13.jar:5.6.13]

查阅文档可知，默认只能查询到10000：

index.max_result_window
The maximum value of from + size for searches to this index.
 Defaults to 10000. Search requests take heap memory and time proportional to from + size and this limits that memory.
See Scroll or Search After for a more efficient alternative to raising this.

解决方法：
修改一下设置，把这个设置到自己想要的极限即可，我这里设置1000000：

PUT policy_document/_settings
{
    
    
  "index":{
    
    
    "max_result_window":1000000
  }
}

修改成功后返回：

{
    
    
  "acknowledged": true
}