elasticsearch - Elasticsearch 协调节点角色-复杂的聚合

Question

我了解到坐标节点广播搜索请求，并使用“查询然后提取阶段”来收集从数据节点接收的结果。

它是在“查询然后取回阶段”的一次迭代中完成的，还是搜索请求可以进行多次查询然后取回阶段的迭代？

假设采取一个来自Elastic Search Complex Scenario的复杂过滤器查询(信用:Val，谢谢@Val)，它会涉及查询的多次迭代然后获取阶段吗？协调节点回答该查询的步骤是什么

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

Answer 1

有一些提示。如果有好奇心的人将其张贴在这里

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.