Combining Queries with Bool Query
The bool query is a compound query clause that allows you to combine multiple queries using boolean logic. It consists of four clauses:
- must: The query must appear in the matching documents.
- filter: The query must appear in the matching documents but does not affect the score.
- should: At least one of these queries must appear in the matching documents.
- must_not: The query must not appear in the matching documents.
Example: Bool Query
GET /products/_search
{
"query": {
"bool": {
"must": [
{ "match": { "description": "wireless headphones" } }
],
"filter": [
{ "term": { "brand": "BrandA" } }
],
"should": [
{ "range": { "price": { "lte": 100 } } }
],
"must_not": [
{ "term": { "color": "red" } }
]
}
}
}
In this example:
- The must clause ensures that the description field contains “wireless headphones“.
- The filter clause ensures that the brand field is “BrandA“.
- The should clause boosts documents where the price field is less than or equal to 100.
- The must_not clause excludes documents where the color field is “red“.
Using Query DSL For Complex Search Queries in Elasticsearch
Elasticsearch is a powerful search engine that provides a flexible and powerful query language called Query DSL (Domain Specific Language). Query DSL allows you to write complex search queries to retrieve the most relevant data from your Elasticsearch indices. This article will guide you through the basics and advanced features of Query DSL, with detailed examples and outputs, to help you master complex search queries in Elasticsearch.