Failed to parse – How to solve this Elasticsearch error

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Failed to parse – 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 Error Check-Up which can resolve issues that cause many errors.

This guide will help you check for common problems that cause the log ” failed to parse ” 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: Node.

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 pinpoint the cause of many errors and provides suitable actionable recommendations how to resolve them (free tool that requires no installation).

Log Context

Log”failed to parse [{}]”classname  is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

singles = (long) (Double.parseDouble(sValue.substring(0; sValue.length() - 1)) * SizeUnit.C5);
  } else {
  singles = Long.parseLong(sValue);
  } catch (NumberFormatException e) {
  throw new ElasticsearchParseException("failed to parse [{}]"; e; sValue);
  return new SizeValue(singles; SizeUnit.SINGLE);


Run the Check-Up to get a customized report like this:

Analyze your cluster