Invalid access token type while Bearer was expected – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7.2-7.15

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Briefly, this error occurs when Elasticsearch receives an invalid access token type during an authentication process. It’s expecting a “Bearer” token type, but it’s getting something different. To resolve this issue, you can check the token type you’re sending in your request. Ensure it’s a “Bearer” token. Also, verify that the token is correctly formatted and hasn’t expired. If you’re using an API client, check its configuration to ensure it’s set to use “Bearer” tokens for authentication.

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This guide will help you check for common problems that cause the log ” Invalid access token type [{}]; while [Bearer] was expected ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.

Log Context

Log “Invalid access token type [{}]; while [Bearer] was expected” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 rpConfig.getResponseType().equals(ResponseType.parse("code"))) {
 assert (accessToken != null) : "Access Token cannot be null for Response Type " + rpConfig.getResponseType().toString();
 final boolean isValidationOptional = rpConfig.getResponseType().equals(ResponseType.parse("code"));
 // only "Bearer" is defined in the specification but check just in case
 if (accessToken.getType().toString().equals("Bearer") == false) {
 throw new ElasticsearchSecurityException("Invalid access token type [{}]; while [Bearer] was expected";
 String atHashValue = idToken.getJWTClaimsSet().getStringClaim("at_hash");
 if (Strings.hasText(atHashValue) == false) {
 if (isValidationOptional == false) {


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