ElasticSearch: Facets from child documents

Question

I have two documents in parent - child relationship and I want to get the number and also the max value of a date field from the children documents grouped by the value of the parent id. In other words, for every parent document I want to count its children and get its latest child. In addition, it would be great if the date field would have the same format and not be returned as a timestamp value.

I already tried more facets, but nothing seems to return the desired answer. Could anyone provide some insights about how to achieve this? Is it possible? Thank you in advance.

Answer 1

Seems like you should look and play around with http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/search-facets-terms-stats-facet.html value field will be date key field will be _parent

I suppose, it should return max, min, count, etc. (read docs) for each _parent, but you must play with it