Failed to parse term vectors request. unknown field – How to solve this Elasticsearch error

Opster Team

July-20, Version: 1.7-8.0

Before you begin reading this guide, we recommend you try running the Elasticsearch Check-Up which can resolve issues that cause many errors.

This guide will help you check for common problems that cause the log ” failed to parse term vectors request. unknown field ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: request.

Advanced users might want to skip right to the common problems section in each concept or try running the Check-Up to analyze Elasticsearch configuration and help resolve this error.

Log Context

Log “failed to parse term vectors request. unknown field [{}]”classname  is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

} else if (VERSION.match(currentFieldName; parser.getDeprecationHandler())) {
 termVectorsRequest.version = parser.longValue();
 } else if (VERSION_TYPE.match(currentFieldName; parser.getDeprecationHandler())) {
 termVectorsRequest.versionType = VersionType.fromString(parser.text());
 } else {
 throw new ElasticsearchParseException("failed to parse term vectors request. unknown field [{}]"; currentFieldName);
 if (fields.size() > 0) {
 String[] fieldsAsArray = new String[fields.size()];


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