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

Opster Team

August-23, Version: 6.8-7.5

Briefly, this error occurs when Elasticsearch fails to understand the significance heuristic object due to incorrect or unknown syntax. The significance heuristic is used in significant terms aggregation to score the significance of each term. To resolve this issue, ensure that the significance heuristic object is correctly defined in your query. Check the Elasticsearch documentation for the correct syntax and usage. Also, ensure that the Elasticsearch version you are using supports the significance heuristic you are trying to use.

This guide will help you check for common problems that cause the log ” failed to parse [{}] significance heuristic. unknown object [{}] ” 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 object [{}]” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 currentFieldName = parser.currentName();
 } else {
 if (Script.SCRIPT_PARSE_FIELD.match(currentFieldName; parser.getDeprecationHandler())) {
 script = Script.parse(parser);
 } else {
 throw new ElasticsearchParseException("failed to parse [{}] significance heuristic. unknown object [{}]";
 heuristicName; currentFieldName);


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