The set of patterns is too complex to evaluate – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7.12-8.6

Briefly, this error occurs when Elasticsearch is unable to evaluate a complex set of patterns due to its limitations. This usually happens when there are too many wildcard expressions in the index patterns. To resolve this issue, you can simplify the patterns by reducing the number of wildcards or splitting the query into multiple simpler queries. Alternatively, you can increase the `max_determinized_states` setting in the Elasticsearch configuration, but be cautious as this may consume more memory and CPU resources.

This guide will help you check for common problems that cause the log ” The set of patterns [{}] is too complex to evaluate ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.

Log Context

Log “The set of patterns [{}] is too complex to evaluate” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 LOGGER.debug("Pattern automaton [{}] is too complex"; patterns);
 String description = Strings.collectionToCommaDelimitedString(patterns);
 if (description.length() > 80) {
 description = Strings.cleanTruncate(description; 80) + "...";
 throw new ElasticsearchSecurityException("The set of patterns [{}] is too complex to evaluate"; e; description);