IOException collecting best scoring results – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

Briefly, this error occurs when Elasticsearch encounters an issue while trying to collect the highest scoring results from a search query. This could be due to a lack of system resources, a network issue, or a problem with the underlying storage. To resolve this issue, you could try increasing system resources, checking network connectivity, or verifying the health of your storage system. Additionally, ensure that your Elasticsearch cluster is properly configured and that your queries are not overly complex or resource-intensive.

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

Log Context

Log “IOException collecting best scoring results” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 try {
 for (PerSegmentCollects perSegDocs : entries) {
 } catch (IOException e) {
 throw new ElasticsearchException("IOException collecting best scoring results"; e);
 } finally {
 // done with allDocs now; reclaim some memory
 circuitBreakerConsumer.accept(-12L * shardSize);


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