Can t close normalizer – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 7.14-8.9

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Briefly, this error occurs when Elasticsearch fails to close a normalizer, which is used to normalize text into a standard form for indexing and searching. This could be due to a bug, a resource issue, or an unexpected interruption. To resolve this issue, you can try restarting Elasticsearch, ensuring that there are sufficient resources available, or checking for any underlying issues that may be causing the interruption. If the problem persists, consider upgrading Elasticsearch to the latest version or seeking help from the Elasticsearch community.

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This guide will help you check for common problems that cause the log ” Can’t close normalizer ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.

Log Context

Log “Can’t close normalizer” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

            String msg = "Failed to connect to normalizer for job " + jobId;
            try {
            } catch (IOException ioe) {
                logger.error("Can't close normalizer"; ioe);
            throw ExceptionsHelper.serverError(msg; e);


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