how to fetch data from elastic search in node js?

Question

I am using NODE JS with elastic search DB . I am using this package https://www.npmjs.com/package/@elastic/elasticsearch I have this collection in my elastic search DB

[
  {
    "_index": "products",
    "_id": "wZRh3n8Bs9qQzO6fvTTS",
    "_score": 1.0,
    "_source": {
      "title": "laptop issues",
      "description": "laptop have issue present in according"
    }
  },
  {
    "_index": "products",
    "_id": "wpRh3n8Bs9qQzO6fvzQM",
    "_score": 1.0,
    "_source": {
      "title": "buy mobile",
      "description": "mobile is in Rs 250"
    }
  },
  {
    "_index": "products",
    "_id": "w5Rh3n8Bs9qQzO6fvzTz",
    "_score": 1.0,
    "_source": {
      "title": "laptop payment",
      "description": "laptop payment is given in any way"
    }
  }
]

now I am planning to fetch data from elastic DB . when I am passing "LAP" or "lap" . it is giving me blank array or [] array why ? "lap" is present in all object

I am doing like that

 const result= await client.search({
      index: 'products',
      query: {
        match_phrase: {
            description: "lap"
        }
      }  

where I am doing wrong . I need all result where lap keywords is present

Answer 1

Match query is not working because you are trying to search partial character of laptop term.

You can use Prefix Query for single term like below:

{
  "query": {
    "prefix": {
      "title": {
        "value": "lap"
      }
    }
  }
}

If you want to search for phrase then you can use Phrase Prefix Query:

{
  "query": {
    "match_phrase_prefix": {
      "title": "lap"
    }
  }
}

If you want to match only some of the word from query then you can use match query with operator set to or.

POST querycheck/_search
{
  "query": {
    "match": {
      "title": {
        "query": "i have issues",
        "operator": "or"
      }
    }
  }
}