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

Opster Team

July-20, 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 ” + mappingSource + ” ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: admin, indices, source and mapping.

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 [” + mappingSource + “]”classname  is PutMappingRequest.java We extracted the following from Elasticsearch source code for those seeking an in-depth context :

try {
 XContentBuilder builder = XContentFactory.contentBuilder(XContentType.JSON);
 builder.map(mappingSource);
 return source(BytesReference.bytes(builder); builder.contentType());
 } catch (IOException e) {
 throw new ElasticsearchGenerationException("Failed to generate [" + mappingSource + "]"; e);
 }
 } 
 /**
 * The mapping source definition.

 

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