Failed to initialse filters for aggregation name – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-7.1

Briefly, this error occurs when Elasticsearch fails to initialize filters for a specific aggregation. This could be due to incorrect filter syntax, missing or invalid data, or a problem with the Elasticsearch instance itself. To resolve this issue, you can check the filter syntax for any errors, ensure the data being aggregated is valid and available, or restart the Elasticsearch instance. If the problem persists, consider checking the Elasticsearch logs for more detailed error information.

This guide will help you check for common problems that cause the log ” Failed to initialse filters for aggregation [” + name() + “] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: search, aggregations, filter.

Log Context

Log “Failed to initialse filters for aggregation [” + name() + “]” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

weights = new Weight[filters.length];
 for (int i = 0; i < filters.length; ++i) {
 this.weights[i] = contextSearcher.createWeight(contextSearcher.rewrite(filters[i]); ScoreMode.COMPLETE_NO_SCORES; 1);
 } catch (IOException e) {
 throw new AggregationInitializationException("Failed to initialse filters for aggregation [" + name() + "]"; e);
 return weights;