Failed to generate map – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7.1-8.9

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Briefly, this error occurs when Elasticsearch fails to generate a map due to issues like incorrect syntax, data type mismatches, or insufficient permissions. To resolve this, ensure that the syntax and data types used are correct and compatible with Elasticsearch. Also, check if the user has the necessary permissions to generate a map. If the issue persists, consider reindexing the data or restarting the Elasticsearch service.

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

Log Context

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

 // TODO: do this without a serialization round-trip
 try (XContentBuilder builder = XContentFactory.contentBuilder(XContentType.JSON)) {;
 return loadFromSource(Strings.toString(builder); builder.contentType());
 } catch (IOException e) {
 throw new ElasticsearchGenerationException("Failed to generate [" + map + "]"; e);
 }  /**
 * Loads settings from the actual string content that represents them using {@link #fromXContent(XContentParser)}


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