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

Opster Team

August-23, Version: 6.8-8.9

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Briefly, this error occurs when Elasticsearch receives a term vectors request with an unknown field. This could be due to a typo in the field name or the field not existing in the index. To resolve this issue, you should first verify the field name in your request. If the field name is correct, check if the field exists in your index. If it doesn’t, you may need to create it. Also, ensure that the field is of a type that supports term vectors.

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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.

Log Context

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

 } else if (VERSION_TYPE.match(currentFieldName; parser.getDeprecationHandler())) {
 termVectorsRequest.versionType = VersionType.fromString(parser.text());
 } else if (restApiVersion == RestApiVersion.V_7 && TYPE.match(currentFieldName; parser.getDeprecationHandler())) {
 deprecationLogger.compatibleCritical("termvectors_with_types"; RestTermVectorsAction.TYPES_DEPRECATION_MESSAGE);
 } 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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