V4: Custom Facet Aggregations

[joemcelroy]

The problem

As a developer, I want to have access to hooks to modify the elasticsearch query to support additional functionality.

*

[CannonNDic]

Hi, There must a an attribute(in Facet filter/attributes) that can collect/aggregate a size of array/nested fields. as simple DSL example below:

query: {
"match_all": {}
},
"aggs": {
"total_api": {
"sum": {
"script": {
"source": "params._source.apiSpecification.size()"
}
}
}
}

***ApiSpecification is the array/nested field that need to be count as per my requirement.

[joemcelroy]

In 4.4.0, you will be able to apply custom agg and filter queries to facets and filter attributes.

Example:

search_settings: {
      search_attributes: ['title', 'actors', 'query'],
      result_attributes: ['title', 'actors', 'query'],
      facet_attributes: [
        {
          field: 'actors.keyword',
          attribute: 'actors',
          type: 'string',
          facetQuery: (field, size) => ({
            significant_terms: {
              field,
              size: size
            }
          }),
          filterQuery: (field, value) => ({
            match: {
              [field]: value
            }}
          )
        }
      ],
      filter_attributes: [
        {
          field: 'writers',
          attribute: 'writers',
          type: 'string',
          filterQuery: (field, value) => ({
            match: {
              [field]: value
            }}
          )        
        }
      ]
    }