Could not parse http response unknown string field – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

Briefly, this error occurs when Elasticsearch encounters an unexpected field in the HTTP response it receives. This could be due to a mismatch in the expected data structure or a change in the API response. To resolve this issue, you can: 1) Check the structure of the HTTP response to ensure it matches what Elasticsearch expects. 2) Update your Elasticsearch code to handle the unexpected field. 3) If the field is not necessary, modify the API to exclude it from the response.

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

Log Context

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

 } else if (token == XContentParser.Token.VALUE_STRING) {
 if (Field.BODY.match(currentFieldName; parser.getDeprecationHandler())) {
 body = parser.text();
 } else {
 throw new ElasticsearchParseException("could not parse http response. unknown string field [{}]"; currentFieldName);
 } else if (token == XContentParser.Token.START_OBJECT) {
 String headerName = null;
 while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
 if (token == XContentParser.Token.FIELD_NAME) {


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