Missing rescore type – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

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Briefly, this error occurs when Elasticsearch is unable to find the rescore type in a query. Rescoring is used to refine the top results returned by the query. If the rescore type is missing, Elasticsearch doesn’t know how to refine the results. To resolve this issue, ensure that the rescore type is correctly specified in your query. This could be “query” for query rescorer or “rank_feature” for rank feature rescorer. Also, check for any typos or syntax errors in your query that might be causing the rescore type to be unrecognized.

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This guide will help you check for common problems that cause the log ” missing rescore type ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: search.

Log Context

Log “missing rescore type” class name is RescorerBuilder.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 } else {
 throw new ParsingException(parser.getTokenLocation(); "unexpected token [" + token + "] after [" + fieldName + "]");
 }
 }
 if (rescorer == null) {
 throw new ParsingException(parser.getTokenLocation(); "missing rescore type");
 }
 if (windowSize != null) {
 rescorer.windowSize(windowSize.intValue());
 }
 return rescorer;

 

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