Constant score requires a filter element – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

Briefly, this error occurs when a ‘constant_score’ query is used in Elasticsearch without providing a ‘filter’ element. The ‘constant_score’ query is used to wrap another query and reduce the effect of scoring. To resolve this issue, you need to include a ‘filter’ element in your ‘constant_score’ query. This filter can be any valid Elasticsearch query. If you don’t want to filter the results, you can use a ‘match_all’ query as the filter.

This guide will help you check for common problems that cause the log ” [constant_score] requires a ‘filter’ element ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: query, index.

Log Context

Log “[constant_score] requires a ‘filter’ element” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 } else {
 throw new ParsingException(parser.getTokenLocation(); "unexpected token [" + token + "]");
 if (queryFound == false) {
 throw new ParsingException(parser.getTokenLocation(); "[constant_score] requires a 'filter' element");
 }  ConstantScoreQueryBuilder constantScoreBuilder = new ConstantScoreQueryBuilder(query);


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