term usage

Let's first look at the definition of term. Term stands for exact match, that is, exact query. The search term will not be split into words before searching.

Here is an example to illustrate, first store some data:

{
    "title": "love China",
    "content": "people very love China",
    "tags": ["China", "love"]
}
{
    "title": "love HuBei",
    "content": "people very love HuBei",
    "tags": ["HuBei", "love"]
}

To use term query:

{
  "query": {
    "term": {
      "title": "love"
    }
  }
}

The result is that the above two data can be queried:

{
  "took": 1,
  "timed_out": false,
  "_shards": {
    "total": 5,
    "successful": 5,
    "skipped": 0,
    "failed": 0
  },
  "hits": {
    "total": 2,
    "max_score": 0.6931472,
    "hits": [
      {
        "_index": "test",
        "_type": "doc",
        "_id": "8",
        "_score": 0.6931472,
        "_source": {
          "title": "love HuBei",
          "content": "people very love HuBei",
          "tags": ["HuBei","love"]
        }
      },
      {
        "_index": "test",
        "_type": "doc",
        "_id": "7",
        "_score": 0.6931472,
        "_source": {
          "title": "love China",
          "content": "people very love China",
          "tags": ["China","love"]
        }
      }
    ]
  }
}

I found that the keywords related to love in the title have been checked out, but I just want to match love China exactly, and see if I can find it according to the following writing method:

{
  "query": {
    "term": {
      "title": "love China"
    }
  }
}

No data is found during execution. Conceptually, term is an exact match, and only a single word can be checked. I want to use term to match multiple words how to do it? You can use terms to:

{
  "query": {
    "terms": {
      "title": ["love", "China"]
    }
  }
}

The query result is:

{
  "took": 1,
  "timed_out": false,
  "_shards": {
    "total": 5,
    "successful": 5,
    "skipped": 0,
    "failed": 0
  },
  "hits": {
    "total": 2,
    "max_score": 0.6931472,
    "hits": [
      {
        "_index": "test",
        "_type": "doc",
        "_id": "8",
        "_score": 0.6931472,
        "_source": {
          "title": "love HuBei",
          "content": "people very love HuBei",
          "tags": ["HuBei","love"]
        }
      },
      {
        "_index": "test",
        "_type": "doc",
        "_id": "7",
        "_score": 0.6931472,
        "_source": {
          "title": "love China",
          "content": "people very love China",
          "tags": ["China","love"]
        }
      }
    ]
  }
}

Find out all the queries, why? Because the [ ] in the terms is multiple or the relationship, as long as one of the words is satisfied. If you want to notify that two words are satisfied, you have to use the must of bool, as follows:

{
  "query": {
    "bool": {
      "must": [
        {
          "term": {
            "title": "love"
          }
        },
        {
          "term": {
            "title": "china"
          }
        }
      ]
    }
  }
}