我正在尝试使用ElasticSearch查询文档进行搜索，这些文档在text字段中有确切的特定值。我知道，对于术语查询，如果它是keyword字段，则是可能的。不幸的是，我不能更改Map。

{
  "my_index": {
    "aliases": {},
    "mappings": {
      "properties": {
        "my_field": {
          "type": "text"
        },
      }
    },
    "settings": {
      "index": {
        "max_ngram_diff": "60",
        "number_of_shards": "8",
        "blocks": {
          "read_only_allow_delete": "false",
          "write": "false"
        },
        "analysis": {...}
      }
    }
  }
}

我尝试了这个term查询，但没有结果：

{
  "size": 10,
  "index": "my_index",
  "body": {
    "query": {
      "bool": {
        "should": [
          {
            "term": {
              "my_field":"MY_VALUE", //not working
            }
          }
        ],
        "must": [],
        "filter": [],
        "minimum_should_match": 1
      }
    }
  }
}

由于似乎不可能找到该值，因此我尝试使用遵循本指南https://www.elastic.co/guide/en/elasticsearch/painless/current/painless-filter-context.html的脚本。因此，我将term更改为match_phrase，并将脚本添加到筛选器：

{
    "size": 10,
    "index": "my_index",
    "body": {
        "query": {
            "bool": {
                "should": [{
                    "match_phrase": {
                        "my_field": {
                            "query": "MY_VALUE",
                            "boost": 1.5,
                            "slop": 0
                        }
                    }
                }],
                "must": [],
                "filter": [{
                    "script": {
                        "script": {
                            "source": "doc['my_field'] == 'MY_VALUE'"
                        }
                    }
                }],
                "minimum_should_match": 1
            }
        }
    }
}

输出结果显示以下错误：

body:
{
  "error": {
    "root_cause": [
      {
        "type": "script_exception",
        "reason": "runtime error",
        "script_stack": [
          "org.opensearch.search.lookup.LeafDocLookup.get(LeafDocLookup.java:101)",
          "org.opensearch.search.lookup.LeafDocLookup.get(LeafDocLookup.java:53)",
          "doc['my_field'] === 'MY_VALUE'",
          "    ^---- HERE"
        ],
        "script": "doc['my_field'] === 'MY_VALUE'",
        "lang": "painless",
        "position": {
          "offset": 4,
          "start": 0,
          "end": 30
        }
      }
    ],
    "type": "search_phase_execution_exception",
    "reason": "all shards failed",
    "phase": "query",
    "grouped": true,
    "failed_shards": [
      {
        "shard": 0,
        "index": "my_index",
        "node": "R99vOHeORlKsk9dnCzcMeA",
        "reason": {
          "type": "script_exception",
          "reason": "runtime error",
          "script_stack": [
            "org.opensearch.search.lookup.LeafDocLookup.get(LeafDocLookup.java:101)",
            "org.opensearch.search.lookup.LeafDocLookup.get(LeafDocLookup.java:53)",
            "doc['my_field'] === 'MY_VALUE'",
            "    ^---- HERE"
          ],
          "script": "doc['my_field'] === 'MY_VALUE'",
          "lang": "painless",
          "position": {
            "offset": 4,
            "start": 0,
            "end": 30
          },
          "caused_by": {
            "type": "illegal_argument_exception",
            "reason": "No field found for [my_field] in mapping with types []"
          }
        }
      }
    ]
  },
  "status": 400
}

我在网上看到doc似乎不包含text字段(term查询同样的问题)。因此，在阅读了其他一些链接后，我尝试了params._source：

"source": "params._source.my_field === 'MY_VALUE'"，但出现此错误：

"script": "params._source.my_field === 'MY_VALUE'",
          "lang": "painless",
          "position": {
            "offset": 14,
            "start": 0,
            "end": 38
          },
          "caused_by": {
            "type": "null_pointer_exception",
            "reason": null
          }

哪个是最好的解决方案？同样没有剧本..。