UTF-8 – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 7.9-8.2

Briefly, this error occurs when Elasticsearch encounters data that is not in the UTF-8 format. Elasticsearch requires all data to be in UTF-8 format. This error can be resolved in several ways. First, you can ensure that all data being sent to Elasticsearch is in UTF-8 format. Second, you can use a tool or script to convert non-UTF-8 data into UTF-8 before sending it to Elasticsearch. Lastly, you can configure your Elasticsearch client to automatically convert non-UTF-8 data into UTF-8.

This guide will help you check for common problems that cause the log ” UTF-8 ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: .

Log Context

Log “UTF-8” classname is LoggedExec.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

        } else {
            out = new ByteArrayOutputStream();
            outputLogger = logger -> {
                try {
                    logger.error(((ByteArrayOutputStream) out).toString("UTF-8"));
                } catch (UnsupportedEncodingException e) {
                    throw new RuntimeException(e);


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