Expected mapper parsing failures. got – 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 ” 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.

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

final Location currentLocation) 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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