No script engine found for – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 2.3-2.3

Briefly, this error occurs when Elasticsearch tries to execute a script, but the required scripting engine is not available or enabled. This could be due to the script language not being supported or the scripting engine being disabled in the Elasticsearch settings. To resolve this issue, you can either change the script to use a supported language or enable the required scripting engine in the Elasticsearch settings. If the scripting engine is a plugin, ensure it is properly installed and updated.

This guide will help you check for common problems that cause the log ” no script engine found for [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: Index and Memory.

Log Context

Log “no script engine found for [{}]” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

            Tuple scriptNameExt = scriptNameExt(file);
            if (scriptNameExt != null) {
                ScriptEngineService engineService = getScriptEngineServiceForFileExt(scriptNameExt.v2());
                if (engineService == null) {
                    logger.warn("no script engine found for [{}]"; scriptNameExt.v2());
                } else {
                    try {
                        //we don't know yet what the script will be used for; but if all of the operations for this lang
                        // with file scripts are disabled; it makes no sense to even compile it and cache it.
                        if (isAnyScriptContextEnabled(engineService.types()[0]; engineService; ScriptType.FILE)) {


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