Failed to serialize source for type ” + type + ” – Elasticsearch Error How To Solve Related Issues

Failed to serialize source for type ” + type + ” – Elasticsearch Error How To Solve Related Issues

Updated: July-20

Elasticsearch Version: 1.7-8.0

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


This guide will help you check for common problems that cause the log “failed to serialize source for type ” + type + “” to appear. It’s important to understand the issues related to the log, so to get started, read the general overview on common issues and tips related to the Elasticsearch concepts: source, index.

Advanced users might want to skip right to the common problems section in each concept or try running the Check-Up which analyses ES to discover the cause of many errors and provides suitable actionable recommendations (free tool that requires no installation). 

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)

Related issues to this log

We have gathered selected Q&A from the community and issues from Github, that can help fix related issues please review the following for further information :

1 Entity framework self referencing loop detected -views 99,569 ,score 102

Elasticsearch fails in parsing datetime field coming from pymongo as object -views   9,149,score 2

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