Rescore TopHits Failed – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

Briefly, this error occurs when Elasticsearch fails to rescore the top hits during a search operation. This could be due to insufficient memory, incorrect query syntax, or a problem with the underlying data. To resolve this issue, you can try increasing the memory allocation for Elasticsearch, checking your query for errors, or reindexing your data. Additionally, ensure that your Elasticsearch version is up-to-date and compatible with your data and queries.

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

Log Context

Log “Rescore TopHits Failed” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 if (subSearchContext.sort() == null) {
 for (RescoreContext ctx : subSearchContext.rescore()) {
 try {
 topDocs = ctx.rescorer().rescore(topDocs; searcher(); ctx);
 } catch (IOException e) {
 throw new ElasticsearchException("Rescore TopHits Failed"; e);
 if (topDocs.scoreDocs.length > 0) {
 maxScore = topDocs.scoreDocs[0].score;


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