elasticsearchHow can I use elasticsearch facets to filter search results?

Elasticsearch facets provide an easy way to filter search results. Facets are used to group results by a certain field. For example, you can use facets to group results by product category or price range.

To use facets, you need to specify the facets parameter in the search query. Here is an example code block:

GET /products/_search
{
  "query": {
    "match_all": {}
  },
  "facets": {
    "categories": {
      "terms": {
        "field": "category"
      }
    }
  }
}

The output of this query will be something like this:

{
  ...
  "facets": {
    "categories": {
      "doc_count_error_upper_bound": 0,
      "sum_other_doc_count": 0,
      "buckets": [
        {
          "key": "phones",
          "doc_count": 10
        },
        {
          "key": "tablets",
          "doc_count": 5
        }
      ]
    }
  }
  ...
}

The code consists of the following parts:

• GET /products/_search - the search query
• query - the search query itself
• facets - the parameter for specifying the facets
• categories - the name of the facet
• terms - the type of facet (terms facet)
• field - the field to group the results by

Here are some ## Helpful links

• Elasticsearch Facets
• Elasticsearch Terms Facet

Edit this code on GitHub