Briefly, this error occurs when Elasticsearch is unable to find any child types for a specified parent type. This could be due to incorrect mapping or the child type not being properly defined. To resolve this issue, you can check the mapping of your index to ensure that the parent-child relationship is correctly defined. Also, ensure that the child type exists and is correctly linked to the parent type. If the error persists, you may need to reindex your data with the correct mapping.
This guide will help you check for common problems that cause the log ” [” + NAME + “] no child types found for type [” + type + “] ” 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 child types found for type [” + type + “]” class name is HasParentQueryBuilder.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :
if (parentFieldMapper.active() && type.equals(parentFieldMapper.type())) {
childTypes.add(documentMapper.type());
}
}
if (childTypes.isEmpty()) {
throw new QueryShardException(context; "[" + NAME + "] no child types found for type [" + type + "]");
} Query childrenQuery;
if (childTypes.size() == 1) {
DocumentMapper documentMapper = context.getMapperService().documentMapper(childTypes.iterator().next());
