Failed to parse significance heuristic unknown field – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-7.5

Briefly, this error occurs when Elasticsearch is unable to parse a significance heuristic due to an unknown field. This usually happens when there’s a typo in the field name or the field doesn’t exist in the index. To resolve this issue, you can check the field name for typos or verify if the field exists in the index. If the field doesn’t exist, you may need to create it. Also, ensure that the field is correctly mapped and the data type is compatible with the significance heuristic.

This guide will help you check for common problems that cause the log ” failed to parse [{}] significance heuristic. unknown field [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: aggregations, search.

Log Context

Log “failed to parse [{}] significance heuristic. unknown field [{}]” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 while (!token.equals(XContentParser.Token.END_OBJECT)) {
 if (BACKGROUND_IS_SUPERSET.match(parser.currentName(); parser.getDeprecationHandler())) {
 backgroundIsSuperset = parser.booleanValue();
 } else {
 throw new ElasticsearchParseException("failed to parse [{}] significance heuristic. unknown field [{}]";
 givenName; parser.currentName());
 token = parser.nextToken();
 return newHeuristic(true; backgroundIsSuperset);


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