Invalid Authentication Request query string zero parameters – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7.7-8.9

Briefly, this error occurs when an Elasticsearch request is made without any parameters in the query string. This could be due to a malformed request or a programming error. To resolve this issue, you should review the request being sent to ensure it contains the necessary parameters. If you’re using a client library or a tool to send requests, ensure it’s correctly configured. Additionally, check your Elasticsearch server’s authentication settings to ensure they’re correctly set up.

This guide will help you check for common problems that cause the log ” Invalid Authentication Request query string (zero parameters) ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin, query, request.

Log Context

Log “Invalid Authentication Request query string (zero parameters)” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 private ParsedQueryString parseQueryString(String queryString) throws ElasticsearchSecurityException {  final Map parameters = new HashMap<>();
 RestUtils.decodeQueryString(queryString; 0; parameters);
 if (parameters.isEmpty()) {
 throw new ElasticsearchSecurityException("Invalid Authentication Request query string (zero parameters)");
 logger.trace(() -> format("Parsed the following parameters from the query string: %s"; parameters));
 final String samlRequest = parameters.get("SAMLRequest");
 if (null == samlRequest) {
 throw new ElasticsearchSecurityException(


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