Could not execute query template failed to close writer – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 1.7-1.7

Briefly, this error occurs when Elasticsearch fails to close the writer after executing a query template. This could be due to a lack of system resources, a bug in the software, or an issue with the underlying storage system. To resolve this issue, you can try restarting Elasticsearch, freeing up system resources, or checking the health of your storage system. If the problem persists, consider upgrading Elasticsearch to the latest version or reaching out to the Elasticsearch community for further assistance.

In addition we recommend you run the Elasticsearch Template Optimizer to fix problems in your data modeling.

It will analyze your templates to detect issues and improve search performance, reduce indexing bottlenecks and optimize storage utilization. The Template Optimizer is free and requires no installation.

Log Context

Log “Could not execute query template (failed to close writer):” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

             logger.error("Could not execute query template (failed to flush writer): "; e);
        } finally {
            try {
            } catch (IOException e) {
                logger.error("Could not execute query template (failed to close writer): "; e);
        return result.bytes();


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