elasticsearch - 从字段中提取关键字

Question

我想写一个查询来分析一个或多个字段？

即当前的分析器要求文本起作用，而不是传递文本，我想传递字段值。

如果我有这样的文件

{
    "desc": "A document description",
    "name": "This name is not original",
    "amount": 3000
}

我想返回类似下面的内容

{
    "desc": ["document", "description"],
    "name": ["name", "original"],
    "amount": 3000
}

Answer 1

您可以使用 Term Vectors或Multi Term Vectors 来实现所需的功能:

https://www.elastic.co/guide/en/elasticsearch/reference/current/docs-multi-termvectors.html

您必须指定想要的字段的 Ids 以及这些字段，它会为您拥有的每个文档以及一些其他可以轻松禁用的信息返回已分析标记的数组。

GET /exampleindex/_doc/_mtermvectors
{
  "ids": [
    "1","2"
  ],
  "parameters": {
    "fields": [
      "*"
    ]
  }
}

将返回以下内容:

"docs": [
    {
      "_index": "exampleindex",
      "_type": "_doc",
      "_id": "1",
      "_version": 2,
      "found": true,
      "took": 0,
      "term_vectors": {
        "desc": {
          "field_statistics": {
            "sum_doc_freq": 5,
            "doc_count": 2,
            "sum_ttf": 5
          },
          "terms": {
            "amazing": {
              "term_freq": 1,
              "tokens": [
                {
                  "position": 1,
                  "start_offset": 3,
                  "end_offset": 10
                }
              ]
            },
            "an": {
              "term_freq": 1,
              "tokens": [
                {
                  "position": 0,
                  "start_offset": 0,
                  "end_offset": 2
                }
              ]
            }