Could not read search request unexpected object field – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-7.15

Briefly, this error occurs when Elasticsearch receives a search request with an unexpected field. This usually happens when there’s a typo in the field name or the field doesn’t exist in the index. To resolve this issue, you can check the field name in your search request and ensure it matches exactly with the field name in your index. If the field doesn’t exist, you may need to add it to your index or remove it from your search request.

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

Log Context

Log “could not read search request. unexpected object field [” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 } else if (INDICES_OPTIONS_FIELD.match(currentFieldName; parser.getDeprecationHandler())) {
 indicesOptions = IndicesOptions.fromXContent(parser; DEFAULT_INDICES_OPTIONS);
 } else if (TEMPLATE_FIELD.match(currentFieldName; parser.getDeprecationHandler())) {
 template = Script.parse(parser; Script.DEFAULT_TEMPLATE_LANG);
 } else {
 throw new ElasticsearchParseException("could not read search request. unexpected object field [" +
 currentFieldName + "]");
 } else if (token == XContentParser.Token.VALUE_STRING) {
 if (INDICES_FIELD.match(currentFieldName; parser.getDeprecationHandler())) {
 String indicesStr = parser.text();


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