Unknown predicate – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

Briefly, this error occurs when Elasticsearch encounters an unknown or undefined predicate in a query. This could be due to a typo, incorrect syntax, or use of a predicate that doesn’t exist. To resolve this issue, you should first verify the predicate used in your query. Ensure that it is spelled correctly and follows the correct syntax. If the error persists, check the Elasticsearch documentation to confirm if the predicate you’re using is valid. If it’s not, replace it with a valid one.

This guide will help you check for common problems that cause the log ” Unknown predicate {} ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: parser, plugin.

Log Context

Log “Unknown predicate {}” class name is ExpressionBuilder.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 case EqlBaseParser.IN:
 List container = expressions(predicate.expression());
 Expression checkInSet = new In(source; expr; container; zoneId);
 return predicate.NOT() != null ? new Not(source; checkInSet) : checkInSet;
 throw new ParsingException(source; "Unknown predicate {}"; source.text());
 }  private Expression combineExpressions(
 List expressions;