Type cannot be an empty string – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 8.6-8.9

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Briefly, this error occurs when an Elasticsearch operation is attempted with an empty string as the type. This could be due to a programming error or incorrect data input. To resolve this issue, ensure that the type field is correctly populated with a valid string before attempting the operation. This could involve adding validation checks to your code or cleaning up your data inputs. Additionally, check your Elasticsearch mappings to ensure they are correctly configured.

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This guide will help you check for common problems that cause the log ” type cannot be an empty string ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: index.

Log Context

Log “type cannot be an empty string” class name is MappingParser.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 if (type == null) {
 throw new MapperParsingException("Failed to derive type");
 if (type.isEmpty()) {
 throw new MapperParsingException("type cannot be an empty string");
 return parse(type; mapping);
 }  private Mapping parse(String type; Map mapping) throws MapperParsingException {


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