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Briefly, this error occurs when Elasticsearch expects a field name in the HTTP response but encounters an unexpected value, such as an empty object [{}]. This could be due to malformed JSON data or incorrect mapping. To resolve this issue, you can: 1) Check the JSON data for any syntax errors or missing field names. 2) Review the mapping to ensure it matches the data structure. 3) If you’re using a client library, ensure it’s compatible with your Elasticsearch version.
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This guide will help you check for common problems that cause the log ” could not parse http response. expected a field name but found [{}] instead ” 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. expected a field name but found [{}] instead” class name is HttpResponse.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :
XContentParser.Token token;
while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
if (token == XContentParser.Token.FIELD_NAME) {
currentFieldName = parser.currentName();
} else if (currentFieldName == null) {
throw new ElasticsearchParseException("could not parse http response. expected a field name but found [{}] instead"; token);
} else if (token == XContentParser.Token.VALUE_NUMBER) {
if (Field.STATUS.match(currentFieldName; parser.getDeprecationHandler())) {
status = parser.intValue();
} else {
throw new ElasticsearchParseException("could not parse http response. unknown numeric field [{}]"; currentFieldName);
