NAME join field – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-7.15

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Briefly, this error occurs when there is an attempt to use a join field in Elasticsearch, but the field is not properly defined or the parent-child relationship is not correctly set up. To resolve this issue, ensure that the join field is correctly defined in the mapping and that the parent-child relationship is properly established. Also, check if the parent document is indexed before the child document. Lastly, ensure that both parent and child documents are in the same shard.

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This guide will help you check for common problems that cause the log ” [” + NAME + “] join field [ ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: query, join.

Log Context

Log “[” + NAME + “] join field [” class name is HasChildQueryBuilder.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 if (joiner.childTypeExists(type) == false) {
 if (ignoreUnmapped) {
 return new MatchNoDocsQuery();
 } else {
 throw new QueryShardException(context; "[" + NAME + "] join field [" + joiner.getJoinField() +
 "] doesn't hold [" + type + "] as a child");
 }
 }  String parentJoinField = joiner.parentJoinField(type);

 

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