+ NAME + no relation found for child ” + type + ” – How to solve this Elasticsearch error

Opster Team

July-20, Version: 1.7-8.0

Before you begin reading this guide, we recommend you try running the Elasticsearch Error Check-Up which analyzes 2 JSON files to detect many configuration errors.

To easily locate the root cause and resolve this issue try AutoOps for Elasticsearch & OpenSearch. It diagnoses problems by analyzing hundreds of metrics collected by a lightweight agent and offers guidance for resolving them.

This guide will help you check for common problems that cause the log ” + NAME + no relation found for child ” + type + ” ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: join and query.

Log Context

Log “[” + NAME + “] no relation found for child [” + type + “]”classname  is ParentIdQueryBuilder.java We extracted the following from Elasticsearch source code for those seeking an in-depth context :

final ParentIdFieldMapper childMapper = joinFieldMapper.getParentIdFieldMapper(type; false);
 if (childMapper == null) {
 if (ignoreUnmapped) {
 return new MatchNoDocsQuery();
 } else {
 throw new QueryShardException(context; "[" + NAME + "] no relation found for child [" + type + "]");
 return new BooleanQuery.Builder()
 .add(childMapper.fieldType().termQuery(id; context); BooleanClause.Occur.MUST)
 // Need to take child type into account; otherwise a child doc of different type with the same id could match


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