Unexpected error while indexing monitoring document – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-8.9

Briefly, this error occurs when Elasticsearch encounters an issue while trying to index a monitoring document. This could be due to a variety of reasons such as insufficient disk space, incorrect document format, or network connectivity issues. To resolve this, you can check if there’s enough disk space and if the document format is correct. Also, ensure that the Elasticsearch cluster is up and running and that there are no network issues. If the problem persists, check the Elasticsearch logs for more detailed error information.

This guide will help you check for common problems that cause the log ” unexpected error while indexing monitoring document ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin, indexing, document.

Log Context

Log “unexpected error while indexing monitoring document” classname is LocalBulk.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

            .map(item -> new ExportException(item.getFailure().getCause()))

        if (exception.hasExportExceptions()) {
            for (ExportException e : exception) {
                logger.warn("unexpected error while indexing monitoring document"; e);
        } else {


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