如何使用Scroll API elasticsearch滚动数据 [英] How to scroll Data using Scroll API elasticsearch

问题描述

我是麋鹿堆栈的新手

• 我尝试了此但没有得到工作流程..

• i have tried from this but not getting working flow ..

例如在搜索查询下执行

POST <index-name>/_search?scroll=2m
{
  "query": {"match_all": {}}
}

• 并从该查询中获取了scroll_id，然后尝试使用滚动搜索检索下一批结果.

GET /_search/scroll
{
  "scroll_id" : "<scroll_id>"
}

• 第一次获得结果

"took" : 2,
  "timed_out" : false,
  "terminated_early" : true,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 13059,
      "relation" : "eq"
    }

• 我的问题是为什么当我尝试使用相同的scroll_id再次滚动时出现错误

"caused_by" : {
      "type" : "search_context_missing_exception",
      "reason" : "No search context found for id"

• 使用的版本

Kibana 7.9.3
Elastic Search 7.9.3

推荐答案

scroll_id值在每个响应中都会更改.因此，下一个搜索呼叫需要使用上一个搜索响应中的新滚动ID.

The scroll_id value changes in every response. So the next search call needs to use the new scroll id from the previous search response.

您正确地开始使用

POST <index-name>/_search?scroll=2m
{
  "query": {"match_all": {}}
}

在得到的响应中，名为_scroll_id的字段包含下一个滚动ID(如游标)，该滚动ID用于下一个调用，让我们将其称为scroll_id_1:

In the response you get, a field called _scroll_id contains the next scroll id to use for the next call (like a cursor), let's call it scroll_id_1:

GET /_search/scroll
{
  "scroll_id" : "<scroll_id_1>",
  "scroll": "2m"
}

在下一个响应中，您将获得一个新的_scroll_id值(我们将其称为scroll_id_2)，您需要将其用于下一个调用:

In that next response, you get a new _scroll_id value (let's call it scroll_id_2) that you need to use it for the next call:

GET /_search/scroll
{
  "scroll_id" : "<scroll_id_2>",
  "scroll": "2m"
}

直到您得到一个空的结果集之前，您都会继续这样做，此时您可以清除搜索上下文

And you keep doing it until you get an empty result set, at which point you can clear the search context

DELETE /_search/scroll
{
  "scroll_id" : "<scroll_id_n>"
}

这篇关于如何使用Scroll API elasticsearch滚动数据的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！