Date-based aggregations

New in Tiki20, this requires Elasticsearch

This adds new facets to the Faceted search

Admin panel -> Search -> Search Results

Click to expand

Demo of Date Facets in Charts

The two lower charts on PluginCustomSearch Chart Examples are based on these aggregations.

Todo: document better

Two new date based aggregations (a.k.a. facets) in this commit: ranges and histograms

See also
Grouped Data Derived Attribute of a date