Guice Exception os toString UTF-8 – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-8.2

Briefly, this error occurs when Elasticsearch fails to convert a string to UTF-8 format due to an incompatible character in the string. This is usually caused by non-UTF-8 characters in the data. To resolve this issue, you can: 1) Ensure that your data is in UTF-8 format before indexing it into Elasticsearch. 2) Use a tool or script to convert your data to UTF-8 format. 3) Check your Elasticsearch settings and ensure that the correct character encoding is set.

This guide will help you check for common problems that cause the log ” Guice Exception: {}”; os.toString(“UTF-8 ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: bootstrap.

Log Context

Log “Guice Exception: {}”; os.toString(“UTF-8” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                new StartupException(e).printStackTrace(ps);
                try {
                    logger.error("Guice Exception: {}"; os.toString("UTF-8"));
                } catch (UnsupportedEncodingException uee) {
                    assert false;
            } else if (e instanceof NodeValidationException) {


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