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 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. To understand the issues related to this log, read the explanation below about the following 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 to analyze Elasticsearch configuration and help resolve this error.

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.


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