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  Anurag Srivastava

  Oct 11, 2020, 8:28:32 AM | Share

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  The boolean query is used to search the results on the basis of joining them with 'or', 'and', 'not' conditions. Like joining two conditions with any of them for example:

  "name": "anurag"  and "age": "30"
  "name": "anurag"  or "name": kapil"

  The above examples are just a representation and not the actual Elasticsearch query. Now let's understand how we can achieve the same type of conditions in Elasticsearch. See the below example:

  GET /blogs/technical/_search
  {
    "query": {
      "bool": {
        "must": [
          {
            "match": {
              "_type": "technical"
            }
          }
        ],
        "must_not": [
          {
            "match": {
              "topic": "kibana"
            }
          }
        ]
      }
    }
  }
  

  In the above query, I am applying the boolean query by passing the "bool" key after the "query" keyword and then under the "bool" block I have provided two blocks "must" and "must_not". These two blocks have a totally different meaning as "must" is there to ensure the existence of the given condition inside the block while "must_not" is there to ensure the non-existence of the given condition inside on the block. Now under the "must" block I have added a "match" block to match the "_type" key with value as "technical" and under "must_not" I have added, "match" block to match the "topic" with "kibana".

  
  

  In this way, we can perform a boolean query in Elasticsearch. If you want to learn more about boolean queries then you can refer to my blog: "Wildcard and Boolean Search in Elasticsearch"

  
  

  In case of any queries please leave your comment.

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