elasticsearch - 如何在Elasticsearch 7.5中过滤嵌套对象？

Question

我有一个映射:

      "ntol-2020-05" : {
        "mappings" : {
          {
            "properties": {
              "_createdAt": {
                "type": "date"
              },
              "_logType": {
                "type": "text",
                "fields": {
                  "keyword": {
                    "type": "keyword",
                    "ignore_above": 256
                  }
                }
              },
              "device": {
                "properties": {
                  ...
                }
              },
              "resp": {
                "type": "nested",
                "properties": {
                  "data": {
                    "type": "nested",
                    "properties": {
                      ...
                    }
                  }
                }
              }
            }
          }
        }
      }
    }

我用三个条件进行过滤:

“_logType”是“crawler”。

“_createdAt” on“2020-05-23”。

“resp”的大小=0。

我正在尝试使用查询进行过滤:

{“query”:{“bool”:{“must”:[{“term”:{“_ logType”:{“value”:“crawler”}}}}，{“range”:{“_ createdAt”:{“gte“:” 2020-05-23“，” lte“:” 2020-05-23“，” time_zone“:” + 07:00“}}}，{” nested“:{” path“:” resp“，“query”:{“script”:{“script”:{“source”:“doc ['resp']。size()> 0”}}}}}}}}，“从”:0，“尺寸“:10}

返回错误:

  "type": "script_exception",
  "reason": "runtime error",
  "script_stack": [
    "org.elasticsearch.search.lookup.LeafDocLookup.get(LeafDocLookup.java:94)",
    "org.elasticsearch.search.lookup.LeafDocLookup.get(LeafDocLookup.java:41)",
    "doc['resp'].size() > 0",
    "    ^---- HERE"
  ],
  "script": "doc['resp'].size() > 0",
  "lang": "painless",
  "caused_by": {
    "type": "illegal_argument_exception",
    "reason": "No field found for [resp] in mapping with types []"
  }
}

如果我使用脚本"doc.containsKey('resp') && doc['resp'].size() > 0"，它将返回hits length = 0。

Help me. Thanks!

Answer 1

您可以使用exist返回“嵌套”字段“resp”具有值的文档。

{
  "query": {
    "bool": {
      "must": [
        {
          "nested": {
            "path": "resp",
            "query": {
              "bool": {
                "filter": {
                  "exists": {
                    "field": "resp"
                  }
                }
              }
            }
          }
        }
      ]
    }
  },
  "from": 0,
  "size": 10
}