Failed to add alias . filter – How to solve related issues

Opster Team

Feb-20, Version: 1.7-8.0

Before you begin reading this guide, we recommend you run Elasticsearch Error Check-Up which analyzes 2 JSON files to detect many errors.

Briefly, this error occurs when Elasticsearch fails to add an alias due to an invalid filter or an error in the request. An alias is a way to associate one or more indices with a single name, and filters can be used to limit the data returned by the alias. To resolve this issue, one can try checking the syntax of the filter and the request, or making sure that the index exists and is properly configured.

To easily locate the root cause and resolve this issue try AutoOps for Elasticsearch & OpenSearch. It diagnoses problems by analyzing hundreds of metrics collected by a lightweight agent and offers guidance for resolving them. Take a self-guided product tour to see for yourself (no registration required).

This guide will help you check for common problems that cause the log ” Failed to add alias . filter ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: alias, cluster, filter and indices.

Log Context

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

                        newAliases.put(alias; indexAliasesService.create(alias; filter));
            } catch (Throwable e) {
                logger.warn("[{}] failed to add alias [{}]; filter [{}]"; e; index; alias; filter);


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