弹性搜索协调节点角色 - 复杂聚合答案

【问题标题】：Elastic search coordinating-node role - complex aggregations弹性搜索协调节点角色 - 复杂聚合
【发布时间】：2020-03-31 18:54:10
【问题描述】：

我理解坐标节点广播搜索请求并使用“查询然后获取阶段”收集从数据节点接收到的结果。

它是在“查询然后获取阶段”的一次迭代中执行的，还是搜索请求可以有多个查询然后获取阶段的迭代？

假设从Elastic Search Complex Scenario 获取一个复杂的过滤器查询（学分：Val，谢谢@Val），它会涉及查询的多次迭代然后获取阶段吗？协调节点回答这个查询的步骤是什么

{
  "query": {
    "filtered": {
      "query": {
        "match": {
          "product_name": "xxx"
        }
      },
      "filter": {
        "bool": {
          "must": [
            {
              "range": {
                "price": {
                  "gte": 20,
                  "lte": 170
                }
              }
            },
            {
              "term": {
                "availability": "availability_status"
              }
            },
            {
              "term": {
                "user": 1
              }
            }
          ]
        }
      }
    }
  }
}

【问题讨论】：

标签： elasticsearch

【解决方案1】：

得到了一些提示。如果有人好奇，请在这里发布它

https://discuss.elastic.co/t/elastic-search-coordinating-node-role-complex-aggregations/225622/5

The details change as various things are optimised and evolve.
There are a number of "it depends" e.g. the "canMatch" pre-flight phase will not run if there's insufficient numbers of shards being queried or custom search routing is used or DFS is used.
Cross-cluster-search is another consideration.

Here's probably a good place to start if you're curious.

【讨论】：