Failed to close file – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 8.3-8.9

Briefly, this error occurs when Elasticsearch is unable to close a file, possibly due to insufficient permissions, a locked file, or a system resource issue. To resolve this, you can try the following: 1) Check and adjust the file permissions to ensure Elasticsearch has the necessary access. 2) Identify and close any processes that may be locking the file. 3) Check system resources to ensure there’s enough disk space and memory. 4) Restart the Elasticsearch service. Always ensure to back up your data before making any changes.

This guide will help you check for common problems that cause the log ” Failed to close [” + file + “] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin, cache.

Log Context

Log “Failed to close [” + file + “]” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

        protected void closeInternal() {
            try {
            } catch (IOException e) {
                // nothing to do but log failures here since closeInternal could be called from anywhere and must not throw
                logger.warn(() -> "Failed to close [" + file + "]"; e);
            } finally {


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