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

Opster Team

August-23, Version: 6.8-7.15

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Briefly, this error occurs when Elasticsearch encounters an unexpected array field in the search request. This usually happens when the request body is incorrectly formatted or contains invalid fields. To resolve this issue, you should first verify the structure of your search request. Ensure that the fields and their values are correctly defined and formatted. If the error persists, check the Elasticsearch documentation for the correct usage of the field causing the error. Lastly, ensure that your Elasticsearch version supports the features used in your search request.

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This guide will help you check for common problems that cause the log ” could not read search request. unexpected array 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 array field [” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 throw new ElasticsearchParseException("could not read search request. expected string values in [" +
 currentFieldName + "] field; but instead found [" + token + "]");
 } else {
 throw new ElasticsearchParseException("could not read search request. unexpected array field [" +
 currentFieldName + "]");
 } else if (token == XContentParser.Token.START_OBJECT) {
 if (BODY_FIELD.match(currentFieldName; parser.getDeprecationHandler())) {
 try (XContentBuilder builder = XContentFactory.jsonBuilder()) {


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