Briefly, this error occurs when the number of join keys specified in an Elasticsearch query does not match the expected number. This could be due to a typo, incorrect syntax, or misunderstanding of the join operation. To resolve this issue, you should first verify the join keys in your query. Ensure that the number of join keys matches the expected number. If the error persists, check the syntax of your query. It’s also important to understand how join operations work in Elasticsearch, as misuse can lead to such errors.
This guide will help you check for common problems that cause the log ” Inconsistent number of join keys specified; expected [{}] but found [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin, parser, join.
Log Context
Log “Inconsistent number of join keys specified; expected [{}] but found [{}]” class name is LogicalPlanBuilder.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :
} else {
if (numberOfKeys != keySize) {
Source src = source(joinTermCtx.by != null ? joinTermCtx.by : joinTermCtx);
int expected = numberOfKeys - parentJoinKeys.size();
int found = keySize - parentJoinKeys.size();
throw new ParsingException(src; "Inconsistent number of join keys specified; expected [{}] but found [{}]"; expected;
found);
}
}
queries.add(joinTerm);
}
