Unexpected error building entity – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

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Briefly, this error occurs when Elasticsearch encounters an issue while creating an entity, possibly due to incorrect or incompatible data types, missing fields, or incorrect mapping. To resolve this, ensure that the data types of the fields match the mapping in the Elasticsearch index. Check if all required fields are present in the document you’re trying to index. Also, verify that the mapping is correctly defined. If the error persists, consider reindexing the data with a new, correct mapping.

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This guide will help you check for common problems that cause the log ” unexpected error building entity ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: reindex.

Log Context

Log “unexpected error building entity” class name is RemoteRequestBuilders.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 }  entity.endObject();
 } catch (IOException e) {
 throw new ElasticsearchException("unexpected error building entity"; e);
 return request;
 }  private static void addIndices(StringBuilder path; String[] indices) {


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