Failed to parse indices privileges for role – How to solve this Elasticsearch exception

Log Context

Log “failed to parse indices privileges for role [{}].” class name is RoleDescriptor.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 if (deniedFields == null) {
 throw new ElasticsearchParseException("failed to parse indices privileges for role [{}]. {} must not " +
 "be null."; roleName; Fields.EXCEPT_FIELDS);
 }
 } else {
 throw new ElasticsearchParseException("failed to parse indices privileges for role [{}]. " +
 "\"{}\"" only accepts options {} and {}; but got: {}"";