Expected mapper parsing failures got – 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 unexpected issues during the mapping process. This could be due to incorrect data types, incorrect field names, or other inconsistencies in the data being indexed. To resolve this issue, you can check the data being indexed for inconsistencies, ensure that the mapping is correctly defined for the data, or use the Elasticsearch error logs to identify the specific issue causing the error.

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This guide will help you check for common problems that cause the log ” expected mapper parsing failures. got ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: replication.

Log Context

Log “expected mapper parsing failures. got” class name is TransportWriteAction.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 throws Exception {
 final Location location;
 if (operationResult.getFailure() != null) {
 // check if any transient write operation failures should be bubbled up
 Exception failure = operationResult.getFailure();
 assert failure instanceof MapperParsingException : "expected mapper parsing failures. got " + failure;
 throw failure;
 } else {
 location = locationToSync(currentLocation; operationResult.getTranslogLocation());
 return location;


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