Could not parse http request unexpected string field – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-7.15

Briefly, this error occurs when Elasticsearch receives an HTTP request that it cannot parse due to an unexpected string field. This usually happens when the request body contains incorrect or unexpected data. To resolve this issue, you should first check the structure and content of your HTTP request. Ensure that the JSON format is correct and all necessary fields are included. If the error persists, check your Elasticsearch version and ensure it’s compatible with your request. Lastly, consider using a tool to validate your JSON data before sending the request.

This guide will help you check for common problems that cause the log ” could not parse http request. unexpected string field [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin, request.

Log Context

Log “could not parse http request. unexpected string field [{}]” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 } else if (Field.BODY.match(currentFieldName; parser.getDeprecationHandler())) {
 } else if (Field.URL.match(currentFieldName; parser.getDeprecationHandler())) {
 } else {
 throw new ElasticsearchParseException("could not parse http request. unexpected string field [{}]";
 } else if (token == XContentParser.Token.VALUE_NUMBER) {
 if (Field.PORT.match(currentFieldName; parser.getDeprecationHandler())) {
 builder.port = parser.intValue();


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