Failed to initialse filter – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.5

Briefly, this error occurs when Elasticsearch fails to initialize a filter due to incorrect filter configuration or missing plugins. The filter might be incorrectly defined in the Elasticsearch query or the required plugin for the filter might not be installed. To resolve this issue, you can check the filter configuration in your query and ensure it is correctly defined. Also, ensure that all necessary plugins for the filter are installed. If the error persists, check the Elasticsearch logs for more detailed error information.

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 Elasticsearch concepts: aggregations, search, filter.

Log Context

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

 if (weight == null) {
 IndexSearcher contextSearcher = context.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;


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