Failed to initialse filter – How to solve this OpenSearch exception

Opster Team

Aug-23, Version: 1-2.9

Before you dig into reading this guide, have you tried asking OpsGPT what this log means? You’ll receive a customized analysis of your log.

Try OpsGPT now for step-by-step guidance and tailored insights into your OpenSearch operation.

Briefly, this error occurs when OpenSearch fails to initialize a filter due to incorrect filter configuration or missing plugins. The filter might be incorrectly defined in the OpenSearch configuration file or the required plugin might not be installed. To resolve this issue, you can check the filter configuration in the OpenSearch configuration file and correct any errors. If the filter requires a plugin, ensure that the plugin is properly installed and enabled. If the problem persists, consider reinstalling the plugin or updating OpenSearch to the latest version.

For a complete solution to your to your search operation, try for free AutoOps for Elasticsearch & OpenSearch . With AutoOps and Opster’s proactive support, you don’t have to worry about your search operation – we take charge of it. Get improved performance & stability with less hardware.

This guide will help you check for common problems that cause the log ” Failed to initialse filter ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: aggregations, filter, search.

Log Context

Log “Failed to initialse filter” class name is We extracted the following from OpenSearch source code for those seeking an in-depth context :

 if (weight == null) {
 IndexSearcher contextSearcher = queryShardContext.searcher();
 try {
 weight = contextSearcher.createWeight(contextSearcher.rewrite(filter); ScoreMode.COMPLETE_NO_SCORES; 1f);
 } catch (IOException e) {
 throw new AggregationInitializationException("Failed to initialse filter"; e);
 return weight;


How helpful was this guide?

We are sorry that this post was not useful for you!

Let us improve this post!

Tell us how we can improve this post?

Get expert answers on Elasticsearch/OpenSearch