GetFreeSwapSpaceSize is not available – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch is unable to retrieve the free swap space size on your system. This could be due to a lack of permissions or an unsupported operating system. To resolve this issue, you can try running OpenSearch with administrative privileges or check if your operating system is compatible with OpenSearch. Alternatively, you can disable the memory check by setting the bootstrap.memory_lock setting to false in the OpenSearch configuration file. However, this could lead to performance issues, so it’s recommended to fix the underlying problem.

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This guide will help you check for common problems that cause the log ” getFreeSwapSpaceSize is not available ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: monitor.

Log Context

Log “getFreeSwapSpaceSize is not available” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

     * Returns the amount of free swap space in bytes.
    public long getFreeSwapSpaceSize() {
        if (getFreeSwapSpaceSize == null) {
            logger.warn("getFreeSwapSpaceSize is not available");
            return 0;
        try {
            final long mem = (long) getFreeSwapSpaceSize.invoke(osMxBean);
            if (mem 


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