Failed to serialize source for type ” + type + ” – 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 serialize source for type ” + type + ” ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: source and index.

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

this.hasNestedObjects = hasNestedObjects; 
 try {
 mappingSource = new CompressedXContent(this; XContentType.JSON; ToXContent.EMPTY_PARAMS);
 } catch (Exception e) {
 throw new ElasticsearchGenerationException("failed to serialize source for type [" + type + "]"; e);
 final Collection deleteTombstoneMetadataFields = Arrays.asList(VersionFieldMapper.NAME; IdFieldMapper.NAME;
 TypeFieldMapper.NAME; SeqNoFieldMapper.NAME; SeqNoFieldMapper.PRIMARY_TERM_NAME; SeqNoFieldMapper.TOMBSTONE_NAME);
 this.deleteTombstoneMetadataFieldMappers = Stream.of(mapping.metadataMappers)


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