Mtermvectors Parameter not supported – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

Briefly, this error occurs when an unsupported parameter is passed to the _mtermvectors API in Elasticsearch. The API doesn’t recognize the parameter and thus throws an error. To resolve this issue, you should review the parameters you’re passing to the API. Ensure they are all supported and correctly spelled. Also, check the Elasticsearch version you’re using, as some parameters might not be supported in older versions. If the problem persists, consider removing all parameters to see if the API works without them, then add them back one by one to identify the problematic parameter.

This guide will help you check for common problems that cause the log ” _mtermvectors: Parameter [{}] not supported ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: .

Log Context

Log “_mtermvectors: Parameter [{}] not supported” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 TermVectorsRequest.parseRequest(template; parser; parser.getRestApiVersion());
 } else {
 throw new ElasticsearchParseException("no parameter named [{}] and type OBJECT"; currentFieldName);
 } else if (currentFieldName != null) {
 throw new ElasticsearchParseException("_mtermvectors: Parameter [{}] not supported"; currentFieldName);
 for (String id : ids) {
 TermVectorsRequest curRequest = new TermVectorsRequest(template);


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