Received a malformed token as part of a invalidation request – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-7.1

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Briefly, this error occurs when Elasticsearch receives an invalid token as part of a cache invalidation request. This could be due to incorrect syntax, a typo, or an expired token. To resolve this issue, you can try the following: 1) Check the syntax of your request and correct any errors. 2) Ensure the token you’re using is valid and not expired. 3) If you’re using a script, ensure it’s correctly formatted and doesn’t contain any errors. 4) If the problem persists, consider resetting your token and trying again.

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This guide will help you check for common problems that cause the log ” received a malformed token as part of a invalidation request ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin, request.

Log Context

Log “received a malformed token as part of a invalidation request” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                        indexInvalidation(Collections.singleton(userToken.getId()); listener; new AtomicInteger(0);
                            "access_token"; null);
                }; listener::onFailure));
            } catch (IOException e) {
                logger.error("received a malformed token as part of a invalidation request"; e);


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