Missing required string claim claimName – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 8.6-8.6

Briefly, this error occurs when Elasticsearch’s JSON Web Token (JWT) authentication fails due to a missing required string claim. The claimName is a piece of information about the user’s identity or role. To resolve this issue, ensure that the JWT contains all the required claims. You can do this by checking the JWT’s payload. If the claim is missing, you need to add it. Alternatively, if the claim is not required, you can modify the Elasticsearch configuration to remove it from the required claims.

This guide will help you check for common problems that cause the log ” missing required string claim [” + claimName + “] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.

Log Context

Log “missing required string claim [” + claimName + “]” class name is JwtStringClaimValidator.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 claimValues = getStringClaimValues(jwtClaimsSet);
 } catch (ParseException e) {
 throw new ElasticsearchSecurityException("cannot parse string claim [" + claimName + "]"; RestStatus.BAD_REQUEST; e);
 if (claimValues == null) {
 throw new ElasticsearchSecurityException("missing required string claim [" + claimName + "]"; RestStatus.BAD_REQUEST);
 }  if (false == claimValues.stream().anyMatch(allowedClaimValues::contains)) {
 throw new ElasticsearchSecurityException(
 "string claim ["


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