title: Kibana error on startup (incompatible nodes)
body: <p>I started using elastic search 7.3.2 and kibana 6.8.3 on mac os mojave 10.14.5.</p>
  
  <p>When kibana starts I got following errors:
  log   [15:21:03.052] [error][status][plugin:xpack_main@7.3.2] Status changed from yellow to red - This version of Kibana requires Elasticsearch v7.3.2 on all nodes. I found the following incompatible nodes in your cluster: <strong>v6.2.4</strong> @ 127.0.0.1:9200 (127.0.0.1)
    log   [15:21:03.052] [error][status][plugin:graph@7.3.2] Status changed from yellow to red - This version of Kibana requires Elasticsearch v7.3.2 on all nodes. I found the following incompatible nodes in your cluster: <strong>v6.2.4</strong> @ 127.0.0.1:9200 (127.0.0.1)</p>
  
  <p>in the past (several years ago) I used version 6.2.4. How can I get those nodes removed ? I do not need them anymore, how can I remove them in order to let kibana starts correctly ?</p>
  
  <p>Thanks for any help if any</p>