elastic/elasticsearch

Support min_children & max_children for nested docs

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#10043 opened on Mar 9, 2015

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 (19 comments) (12 reactions) (0 assignees)Java (76,700 stars) (25,882 forks)batch import
:Search Relevance/Search>enhancementTeam:Search Relevancehelp wantedstalled

Description

I am opening this as a separate issue since the previous issue was closed with support for parent-child docs (https://github.com/elasticsearch/elasticsearch/issues/6019#issuecomment-77785163).

We would love to have support for min_children & max_children or similar also for nested filters/docs. http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/query-dsl-has-child-filter.html#_min_max_children_2

Thanks a keep up the great work.

Contributor guide

Tech stack
java
Domain
backend
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
5
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
over 1 week
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Knowledge of Elasticsearch nested documentsFamiliarity with Lucene index structureUnderstanding of has child filter implementation
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
15
Research direction
Investigate the Elasticsearch source code to understand how nested documents and the has child filter are implemented. The existing min children/max children support for has child queries is a reference. The goal is to extend similar functionality to nested queries. Key files to examine include NestedQueryBuilder, Filters, and related Lucene classes. The maintainers' comments in the issue (19 comments) may provide additional implementation hints.