Failed to generate ” + map + ” – How to solve this Elasticsearch error

Opster Team

March-22, Version: 1.7-8.0

Before you begin reading this guide, we recommend you try running the Elasticsearch Check-Up which can resolve issues that cause many errors.

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.

Advanced users might want to skip right to the common problems section in each concept or try running the Check-Up to analyze Elasticsearch configuration and help resolve this error.

Log Context

Log “Failed to generate [” + map + “]”classname  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)}


Try AutoOps to detect and fix issues in your cluster:

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