Failed to parse aliases – How to solve this Elasticsearch error

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Failed to parse aliases – 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 aliases ” 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: admin, indices, template and aliases.

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 aliases”classname  is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

while ((parser.nextToken()) != XContentParser.Token.END_OBJECT) {
  return this;
  } catch(IOException e) {
  throw new ElasticsearchParseException("Failed to parse aliases"; e);
  * Adds an alias that will be added when the index gets created.


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

Analyze your cluster