Aggregations
Aggregations allow you to summarize and analyze your data. They can be used to perform arithmetic, create histograms, compute statistics, and more.
Example: Aggregations
Let’s aggregate the average rating of products by brand.
GET /products/_search
{
"size": 0,
"aggs": {
"avg_rating_by_brand": {
"terms": {
"field": "brand"
},
"aggs": {
"avg_rating": {
"avg": {
"field": "reviews.rating"
}
}
}
}
}
}
In this example:
- We use a terms aggregation to group products by the brand field.
- We nest an avg aggregation to calculate the average reviews.rating for each brand.
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.