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Briefly, this error occurs when Elasticsearch tries to execute a join operation but cannot find a configured join field. This is usually due to a misconfiguration in the mapping of the index. To resolve this issue, you can either reconfigure the mapping of the index to include a join field or modify your query to avoid the join operation. If you choose to reconfigure the mapping, remember that you will need to reindex your data.
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This guide will help you check for common problems that cause the log ” [” + NAME + “] no join field has been configured ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: join, query.
Log Context
Log “[” + NAME + “] no join field has been configured” class name is HasChildQueryBuilder.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :
Joiner joiner = Joiner.getJoiner(context);
if (joiner == null) {
if (ignoreUnmapped) {
return new MatchNoDocsQuery();
} else {
throw new QueryShardException(context; "[" + NAME + "] no join field has been configured");
}
} if (joiner.childTypeExists(type) == false) {
if (ignoreUnmapped) {
