Elasticsearch Ranger Kerbeos

I want to use Ranger to control the access to elasticsearch, so I intall elasticsearch 7.1.1, and open kerberos for es. after install elasticsearch-ranger plugin, it can Synchronize policy from ranger, and kerberos Certification has passed,but when I send url like this, an error occurred, any suggestion is thansful.
ranger-elasticsearch plugin introduction

curl -XGET --tlsv1.2 --negotiate -k -u elasticsearch: ''
"error" : {
"root_cause" : [
"type" : "status_exception",
"reason" : "Error: Failed to parse user authentication."
"type" : "status_exception",
"reason" : "Error: Failed to parse user authentication.",
"caused_by" : {
"type" : "illegal_argument_exception",
"reason" : "Illegal base64 character 20"
"status" : 401

ranger version is 2.0.0

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