Failed to close – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-8.2

Briefly, this error occurs when Elasticsearch encounters an issue while trying to close a resource such as an index, a node, or a connection. This could be due to a variety of reasons such as insufficient permissions, network issues, or a bug in the software. To resolve this issue, you could try restarting the Elasticsearch service, checking the system’s permissions, or updating Elasticsearch to the latest version. If the problem persists, you may need to investigate further into the system logs for more detailed error information.

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

Log Context

Log “Failed to close [{}]” 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(() -> new ParameterizedMessage("Failed to close [{}]"; file); e);
            } finally {


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