Failed to execute main query – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

Briefly, this error occurs when Elasticsearch is unable to execute the main query due to reasons like incorrect query syntax, insufficient memory, or unavailability of a required index. To resolve this, you can check the query syntax for any errors, ensure that there is enough memory for Elasticsearch to operate, and verify that all necessary indices are available and not corrupted. Additionally, checking the Elasticsearch logs can provide more detailed information about the cause of the error.

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

Log Context

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

 if (timeoutRunnable != null) {
 } catch (Exception e) {
 throw new QueryPhaseExecutionException(searchContext.shardTarget(); "Failed to execute main query"; e);
 }  private static CollectorManager wrapWithProfilerCollectorManagerIfNeeded(
 Profilers profilers;