How to combine multiple queries using Boolean logic in Elasticsearch?

To combine multiple queries using Boolean logic in Elasticsearch, you can use a bool query. Here are the general steps to construct a bool query with multiple sub-queries:

1. Choose the fields: Identify the fields that you want to search on in your Elasticsearch index.

2. Define the sub-queries: Construct the individual queries using the Elasticsearch Query DSL. You can use any type of query, such as match queries, term queries, range queries, or other bool queries. Here’s an example of two sub-queries, one that searches for documents containing the term “apple” in the “product_name” field and another that searches for documents containing the term “red” in the “color” field:

{
  "query": {
    "bool": {
      "must": [
        { "match": { "product_name": "apple" } },
        { "match": { "color": "red" } }
      ]
    }
  }
}

3. Combine the sub-queries with Boolean operators: Use Boolean operators like “must”, “should”, and “must_not” to specify how the sub-queries should be combined. In the example above, the “must” operator is used to specify that both sub-queries must match for a document to be considered a match.

4. Execute the query: Send the query to Elasticsearch using the Search API. The API will return a list of documents that match the query criteria.

Note that you can combine any number of sub-queries together using Boolean logic in a bool query. You can also use nested bool queries to construct more complex search criteria. By combining multiple queries together using Boolean logic, you can construct more sophisticated search criteria that can help you find the documents you’re looking for more efficiently.