[大数据]elasticsearch 7.6 max_result_window 参数

os: centos 7.6
es: 7.6

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.

这是个动态参数，可以实时调整。

版本

# cat /etc/centos-release
CentOS Linux release 7.6.1810 (Core)

# yum list installed |grep -i elasticsearch
elasticsearch.x86_64               7.6.2-1                             installed


# cat /etc/hosts
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6

192.168.56.211  n1
192.168.56.212  n2
192.168.56.213  n3
192.168.56.214  n4

max_result_window

curl -X PUT 'http://192.168.56.211:9200/testindex1' -H 'Content-Type: application/json' -d ' 
{
    "settings": {
     "number_of_shards": 8,
	 "number_of_replicas" : 2
    }
}
'

curl -X GET 'http://192.168.56.211:9200/testindex1/_settings?pretty' 

{
  "testindex1" : {
    "settings" : {
      "index" : {
        "creation_date" : "1628491780428",
        "number_of_shards" : "8",
        "number_of_replicas" : "2",
        "uuid" : "tEffkMpPRHuLftMch57W6g",
        "version" : {
          "created" : "7060299"
        },
        "provided_name" : "testindex1"
      }
    }
  }
}

curl -X PUT 'http://192.168.56.211:9200/testindex1/_settings' -H 'Content-Type: application/json' -d '
{ 
  "index" : { 
      "max_result_window" : 100000000
  }
}
'

curl -X GET 'http://192.168.56.211:9200/testindex1/_settings?pretty' 

{
  "testindex1" : {
    "settings" : {
      "index" : {
        "number_of_shards" : "8",
        "provided_name" : "testindex1",
        "max_result_window" : "100000000",
        "creation_date" : "1628491780428",
        "number_of_replicas" : "2",
        "uuid" : "tEffkMpPRHuLftMch57W6g",
        "version" : {
          "created" : "7060299"
        }
      }
    }
  }
}

参考:
https://www.elastic.co/guide/en/elasticsearch/reference/7.6/index-modules.html
https://www.elastic.co/guide/en/elasticsearch/reference/7.6/search-request-body.html#request-body-search-search-after
https://www.elastic.co/guide/en/elasticsearch/reference/7.6/search-request-body.html#request-body-search-scroll