ElasticSearch doesn't work when multiple words don't have space-CodePudding

When I'm trying to search using Loremipsum it's returning empty array. I would like to get Lorem ipsum dolor using Loremipsum query.

value

Lorem ipsum dolor

query

GET favorite_candy/_search
{
  "query": {
    "multi_match": {
      "query": "Loremipsum"
    }
  }
}

result

"hits" : [ ]

CodePudding user response：

This happens because there is no correspondence between the search token and the indexed tokens. In other words, the term "Loremipsum" does not find any corresponding token.

In my experience I see this as the possibility of using "did you mean". Once the term is incorrect, you can return suggestions for correct terms to the user.

In this case I did a test with Completion Suggestion. Note that I used the "preserve_separators" property so that you will get suggestions when you type the words together.

Query

PUT idx_test
{
  "mappings": {
    "properties": {
      "suggest": {
        "type": "completion",
        "preserve_separators": false
      }
    }
  }
}


PUT idx_test/_doc/1
{
  "suggest": ["Lorem ipsum dolor"]
}


GET idx_test/_search
{
  "suggest": {
    "any-suggest": {
      "prefix": "loremipsum",
      "completion": {
        "field": "suggest"
      }
    }
  }
}

Response

"suggest": {
    "any-suggest": [
      {
        "text": "loremipsum",
        "offset": 0,
        "length": 10,
        "options": [
          {
            "text": "Lorem ipsum dolor",
            "_index": "idx_test",
            "_id": "1",
            "_score": 1,
            "_source": {
              "suggest": [
                "Lorem ipsum dolor"
              ]
            }
          }
        ]
      }
    ]
  }