KameletBinding from KafkaTopic to elasticsearch-index-sink seems to require user parameter

apiVersion: camel.apache.org/v1alpha1
kind: KameletBinding
metadata:
  name: kafkatopic-to-elastic
spec:
  source:
    ref:
      kind: KafkaTopic
      apiVersion: kafka.strimzi.io/v1beta2
      name: 'mytopic'
  sink:
    ref:
      kind: Kamelet
      apiVersion: camel.apache.org/v1alpha1
      name: elasticsearch-index-sink
    properties:
      clusterName: "quickstart"
      hostAddresses: "quickstart-es-http:9200"

[1] 2021-07-13 15:28:32,086 ERROR [org.apa.cam.qua.mai.CamelMainRuntime] (main) Failed to start application: org.apache.camel.RuntimeCamelException: org.apache.camel.VetoCamelContextStartException: Failure creating route from template: elasticsearch-index-sink
[1] 
...
[1] Caused by: org.apache.camel.FailedToCreateRouteException: Failed to create route sink at: >>> DynamicTo[kamelet-reify:elasticsearch-rest:{{clusterName}}?hostAddresses=RAW({{hostAddresses}})&operation=INDEX&indexName=${exchangeProperty.esIndexName}&enableSSL={{enableSSL}}&user={{user}}&password={{password}}] <<< in route: Route(sink)[From[kamelet://source?routeId=sink] -> [Choice[[... because of Failed to resolve endpoint: kamelet-reify:elasticsearch-rest:{{clusterName}}?hostAddresses=RAW({{hostAddresses}})&operation=INDEX&indexName=${exchangeProperty.esIndexName}&enableSSL={{enableSSL}}&user={{user}}&password=xxxxxx due to: Property with key [user] not found in properties from text: kamelet-reify:elasticsearch-rest:quickstart?hostAddresses=RAW(quickstart-es-http:9200)&operation=INDEX&indexName=${exchangeProperty.esIndexName}&enableSSL=true&user={{user}}&password={{password}}