Failed to build xcontent – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.5

Briefly, this error occurs when Elasticsearch is unable to construct the necessary XContent, which is a format used for JSON-like content. This could be due to incorrect or malformed data input. To resolve this issue, you can: 1) Check the data you’re trying to index for any inconsistencies or errors. 2) Validate your JSON input to ensure it’s correctly formatted. 3) Review your Elasticsearch logs for more detailed error information. 4) If you’re using a client library, ensure it’s compatible with your Elasticsearch version.

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

Log Context

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

 XContentBuilder builder = XContentFactory.jsonBuilder();
 toXContent(builder; EMPTY_PARAMS);
 return Strings.toString(builder);
 } catch (Exception e) {
 throw new ElasticsearchException("Failed to build xcontent."; e);


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