Add support for tag & exclusion for facets
Description
Introduction
your domain model has a field called " Document Type", this field is single-valued, it describes the mime-type of your document
e.g.
Doc1
docType: PDF
Doc2
docType:HTML
...
when faceting on such field, you would like to see stats over the result set with the counts:
what happens if you select one facet? your result set is reduced
this is what you get for the counts:
you lose the ability to navigate fully the result set, but you get accurate counts, not incorrect
Scope of this ticket
Ideal solution (Tag & Exclusion)
Scope of this ticket is to implement in Elasticsearch the Tag & Exclusion feature.
It is supported by Alfresco through the following parameters in a filter query:
The parameters for the filterQueries element are:
Parameter | Type | Description | Accessor |
|---|---|---|---|
query | String | The filter query expression. For multi-select facets, selected facets must be ordered together. | org.alfresco.service.cmr.search.SearchParameters#getFilterQueries |
tags | String | The tags used exclude the filters from facet evaluation for multi-select facet support. | The tags are flattened in the same SearchParameters : |
Some potential material to fully understand the problem:
https://sease.io/2018/12/apache-solr-facets-and-acl-filters-using-tag-and-exclusion.html
http://yonik.com/multi-select-faceting/
Solution In Elasticsearch
there is no easy support for tag & exclusion in Elasticsearch.
Similar behaviour can be achieved using filters in aggregations and PostFilters.
Activity
The ticket has been created after a first analysis and implementation, which revealed the need of a further investigation. In the meantime, here’s the code snippet where we managed the tag exclusions (within ElasticsearchQueryExecutor):
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