Failed to generate – 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 generate a response due to issues like insufficient memory, incorrect configurations, or corrupted indices. To resolve this, you can increase the heap size if memory is the issue. If it’s due to incorrect configurations, review and correct them. If the error is due to corrupted indices, you can try to repair them or, as a last resort, delete and recreate them. Always ensure to backup your data before making any major changes.

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

Log Context

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

 builder.field(source[i++].toString(); source[i]);
 return source(builder);
 } catch (IOException e) {
 throw new ElasticsearchGenerationException("Failed to generate"; e);
 }  /**
 * Sets the document to index in bytes form.


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