Could not read search request unknown value – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-7.9

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Briefly, this error occurs when Elasticsearch receives a search request with an unknown or unrecognized value. This could be due to a typo, incorrect syntax, or a non-existent field in the request. To resolve this issue, you should first verify the syntax of your search request. Make sure all fields and values are correctly spelled and formatted. If the syntax is correct, check that the fields in your request actually exist in your Elasticsearch index. If they don’t, you’ll need to either create them or modify your request to use existing fields.

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

Log Context

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

 case "none":
 expandOpen = false;
 expandClosed = false;
 throw new ElasticsearchParseException("could not read search request. unknown value [" +
 parser.text() + "] for [" + currentFieldName + "] field ");
 } else if (IGNORE_UNAVAILABLE_FIELD.match(currentFieldName; parser.getDeprecationHandler())) {
 ignoreUnavailable = parser.booleanValue();
 } else if (ALLOW_NO_INDICES_FIELD.match(currentFieldName; parser.getDeprecationHandler())) {


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